Merge branch 'release/v1.6.0'

2025-01-08 00:39:22 +02:00 · 2023-04-21 14:22:05 +12:00 · 2023-04-21 14:22:05 +12:00 · 176f128057
commit 176f128057
parent 26a84bc257 031b5697e4
27 changed files with 1308 additions and 2279 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -2,6 +2,25 @@

 Notable changes to Mailpit will be documented in this file.

+## [v1.6.0]
+
+### API
+- Enable cross-origin resource sharing (CORS) configuration
+- Message relay / release
+- Include Return-Path in message summary data
+
+### Feature
+- Inject/update Bcc header for missing addresses when SMTP recipients do not match messsage headers
+
+### Libs
+- Update Go modules
+- Update node modules
+
+### UI
+- Display Return-Path if different to the From address
+- Message release functionality
+
+
 ## [v1.5.5]

 ### Docker
--- a/README.md
+++ b/README.md
@ -27,8 +27,8 @@ Mailpit is inspired by [MailHog](#why-rewrite-mailhog), but much, much faster.
 - Optional browser notifications for new mail (HTTPS only)
 - Configurable automatic email pruning (default keeps the most recent 500 emails)
 - Email storage either in a temporary or persistent database ([see wiki](https://github.com/axllent/mailpit/wiki/Email-storage))
- Fast SMTP processing & storing - approximately 70-100 emails per second depending on CPU, network speed & email size
- Can handle tens of thousands of emails
+- Fast SMTP processing & storing - approximately 70-100 emails per second depending on CPU, network speed & email size, easily handling tens of thousands of emails
+- SMTP relaying / message release - relay messages via a different SMTP server ([see wiki](https://github.com/axllent/mailpit/wiki/SMTP-relay))
 - Optional SMTP with STARTTLS & SMTP authentication, including an "accept anything" mode ([see wiki](https://github.com/axllent/mailpit/wiki/SMTP-with-STARTTLS-and-authentication))
 - Optional HTTPS for web UI ([see wiki](https://github.com/axllent/mailpit/wiki/HTTPS))
 - Optional basic authentication for web UI ([see wiki](https://github.com/axllent/mailpit/wiki/Basic-authentication))
@ -90,8 +90,8 @@ You can build a Mailpit-specific sendmail binary from source (see [building from

 ## Why rewrite MailHog?

-I had been using MailHog for a few years to intercept and test emails generated from several projects. MailHog has a number of severe performance issues, many of the modules are horribly out of date, and other than a few accepted MRs, it is not actively developed.
+I had been using MailHog for a few years to intercept and test emails generated from several projects. MailHog has a number of performance issues, many of the frontend and Go modules are horribly out of date, and it is not actively developed.

-Initially I started trying to upgrade a fork of MailHog (both the UI as well as the HTTP server & API), but soon discovered that it is (with all due respect) very poorly designed. It is over-engineered (split over 9 separate projects) and has too many unnecessary features for my purpose. It performs exceptionally poorly when dealing with large amounts of emails or processing any email with an attachment (a single email with a 3MB attachment can take over a minute to ingest). The API also transmits a lot of duplicate and unnecessary data on every message request for all web calls, and there is no HTTP compression.
+Initially I tried to upgrade a fork of MailHog (both the UI as well as the HTTP server & API), but soon discovered that it is (with all due respect to its authors) poorly designed. It is in my opinion over-engineered (split over 9 separate projects), and performs very poorly when dealing with large amounts of emails or processing emails with an attachments (a single email with a 3MB attachment can take over a minute to ingest). Finally, the API transmits a lot of duplicate and unnecessary data on every browser request, and there is no HTTP compression.

 In order to improve it I felt it needed to be completely rewritten, and so Mailpit was born.
--- a/cmd/root.go
+++ b/cmd/root.go
@ -85,6 +85,7 @@ func init() {
 	rootCmd.Flags().StringVarP(&config.HTTPListen, "listen", "l", config.HTTPListen, "HTTP bind interface and port for UI")
 	rootCmd.Flags().IntVarP(&config.MaxMessages, "max", "m", config.MaxMessages, "Max number of messages to store")
 	rootCmd.Flags().StringVar(&config.Webroot, "webroot", config.Webroot, "Set the webroot for web UI & API")
+	rootCmd.Flags().StringVar(&server.AccessControlAllowOrigin, "api-cors", server.AccessControlAllowOrigin, "Set API CORS Access-Control-Allow-Origin header")
 	rootCmd.Flags().BoolVar(&config.UseMessageDates, "use-message-dates", config.UseMessageDates, "Use message dates as the received dates")

 	rootCmd.Flags().StringVar(&config.UIAuthFile, "ui-auth-file", config.UIAuthFile, "A password file for web UI authentication")
@ -98,8 +99,11 @@ func init() {
 	rootCmd.Flags().BoolVar(&config.SMTPAuthAllowInsecure, "smtp-auth-allow-insecure", config.SMTPAuthAllowInsecure, "Enable insecure PLAIN & LOGIN authentication")
 	rootCmd.Flags().StringVarP(&config.SMTPCLITags, "tag", "t", config.SMTPCLITags, "Tag new messages matching filters")

-	rootCmd.Flags().BoolVarP(&config.QuietLogging, "quiet", "q", config.QuietLogging, "Quiet logging (errors only)")
-	rootCmd.Flags().BoolVarP(&config.VerboseLogging, "verbose", "v", config.VerboseLogging, "Verbose logging")
+	rootCmd.Flags().StringVar(&config.SMTPRelayConfigFile, "smtp-relay-config", config.SMTPRelayConfigFile, "SMTP configuration file to allow releasing messages")
+	rootCmd.Flags().BoolVar(&config.SMTPRelayAllIncoming, "smtp-relay-all", config.SMTPRelayAllIncoming, "Relay all incoming messages via external SMTP server (caution!)")
+
+	rootCmd.Flags().BoolVarP(&logger.QuietLogging, "quiet", "q", logger.QuietLogging, "Quiet logging (errors only)")
+	rootCmd.Flags().BoolVarP(&logger.VerboseLogging, "verbose", "v", logger.VerboseLogging, "Verbose logging")

 	// deprecated flags 2022/08/06
 	rootCmd.Flags().StringVarP(&config.UIAuthFile, "auth-file", "a", config.UIAuthFile, "A password file for web UI authentication")
@ -179,9 +183,21 @@ func initConfigFromEnv() {
 		config.SMTPAuthAllowInsecure = true
 	}

+	// Relay server config
+	if len(os.Getenv("MP_SMTP_RELAY_CONFIG")) > 0 {
+		config.SMTPRelayConfigFile = os.Getenv("MP_SMTP_RELAY_CONFIG")
+	}
+	if getEnabledFromEnv("MP_SMTP_RELAY_ALL") {
+		config.SMTPRelayAllIncoming = true
+	}
+
+	// Misc options
 	if len(os.Getenv("MP_WEBROOT")) > 0 {
 		config.Webroot = os.Getenv("MP_WEBROOT")
 	}
+	if len(os.Getenv("MP_API_CORS")) > 0 {
+		server.AccessControlAllowOrigin = os.Getenv("MP_API_CORS")
+	}
 	if getEnabledFromEnv("MP_USE_MESSAGE_DATES") {
 		config.UseMessageDates = true
 	}
@ -189,10 +205,10 @@ func initConfigFromEnv() {
 		config.UseMessageDates = true
 	}
 	if getEnabledFromEnv("MP_QUIET") {
-		config.QuietLogging = true
+		logger.QuietLogging = true
 	}
 	if getEnabledFromEnv("MP_VERBOSE") {
-		config.VerboseLogging = true
+		logger.VerboseLogging = true
 	}
 }

--- a/cmd/sendmail.go
+++ b/cmd/sendmail.go
@ -12,11 +12,11 @@ var (

 // sendmailCmd represents the sendmail command
 var sendmailCmd = &cobra.Command{
-	Use:   "sendmail",
-	Short: "A sendmail command replacement",
-	Long: `A sendmail command replacement.
+	Use:   "sendmail [flags] [recipients]",
+	Short: "A sendmail command replacement for Mailpit",
+	Long: `A sendmail command replacement for Mailpit.
 	
-You can optionally create a symlink called 'sendmail' to the main binary.`,
+You can optionally create a symlink called 'sendmail' to the Mailpit binary.`,
 	Run: func(_ *cobra.Command, _ []string) {
 		sendmail.Run()
 	},
@ -26,8 +26,12 @@ func init() {
 	rootCmd.AddCommand(sendmailCmd)

 	// these are simply repeated for cli consistency
+	sendmailCmd.Flags().StringVarP(&fromAddr, "from", "f", fromAddr, "SMTP sender")
 	sendmailCmd.Flags().StringVar(&smtpAddr, "smtp-addr", smtpAddr, "SMTP server address")
-	sendmailCmd.Flags().StringVarP(&fromAddr, "from", "f", "", "SMTP sender")
+	sendmailCmd.Flags().BoolVarP(&sendmail.Verbose, "verbose", "v", false, "Verbose mode (sends debug output to stderr)")
+	sendmailCmd.Flags().BoolP("long-b", "b", false, "Ignored. This flag exists for sendmail compatibility.")
 	sendmailCmd.Flags().BoolP("long-i", "i", false, "Ignored. This flag exists for sendmail compatibility.")
+	sendmailCmd.Flags().BoolP("long-o", "o", false, "Ignored. This flag exists for sendmail compatibility.")
+	sendmailCmd.Flags().BoolP("long-s", "s", false, "Ignored. This flag exists for sendmail compatibility.")
 	sendmailCmd.Flags().BoolP("long-t", "t", false, "Ignored. This flag exists for sendmail compatibility.")
 }
--- a/config/config.go
+++ b/config/config.go
@ -10,8 +10,10 @@ import (
 	"regexp"
 	"strings"

+	"github.com/axllent/mailpit/utils/logger"
 	"github.com/mattn/go-shellwords"
 	"github.com/tg123/go-htpasswd"
+	"gopkg.in/yaml.v3"
 )

 var (
@ -30,15 +32,6 @@ var (
 	// UseMessageDates sets the Created date using the message date, not the delivered date
 	UseMessageDates bool

-	// VerboseLogging for console output
-	VerboseLogging = false
-
-	// QuietLogging for console output (errors only)
-	QuietLogging = false
-
-	// NoLogging for tests
-	NoLogging = false
-
 	// UITLSCert file
 	UITLSCert string

@ -63,8 +56,8 @@ var (
 	// SMTPAuthFile for SMTP authentication
 	SMTPAuthFile string

-	// SMTPAuth used for euthentication
-	SMTPAuth *htpasswd.File
+	// SMTPAuthConfig used for authentication auto-generated from SMTPAuthFile
+	SMTPAuthConfig *htpasswd.File

 	// SMTPAuthAllowInsecure allows PLAIN & LOGIN unencrypted authentication
 	SMTPAuthAllowInsecure bool
@ -79,7 +72,20 @@ var (
 	TagRegexp = regexp.MustCompile(`^([a-zA-Z0-9\-\ \_]){3,}$`)

 	// SMTPTags are expressions to apply tags to new mail
-	SMTPTags []Tag
+	SMTPTags []AutoTag
+
+	// SMTPRelayConfigFile to parse a yaml file and store config of relay SMTP server
+	SMTPRelayConfigFile string
+
+	// SMTPRelayConfig to parse a yaml file and store config of relay SMTP server
+	SMTPRelayConfig smtpRelayConfigStruct
+
+	// ReleaseEnabled is whether message releases are enabled, requires a valid SMTPRelayConfigFile
+	ReleaseEnabled = false
+
+	// SMTPRelayAllIncoming is whether to relay all incoming messages via preconfgured SMTP server.
+	// Use with extreme caution!
+	SMTPRelayAllIncoming = false

 	// ContentSecurityPolicy for HTTP server
 	ContentSecurityPolicy = "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; frame-src 'self'; img-src * data: blob:; font-src 'self' data:; media-src 'self'; connect-src 'self' ws: wss:; object-src 'none'; base-uri 'self';"
@ -94,12 +100,25 @@ var (
 	RepoBinaryName = "mailpit"
 )

-// Tag struct
-type Tag struct {
+// AutoTag struct for auto-tagging
+type AutoTag struct {
 	Tag   string
 	Match string
 }

+// SMTPRelayConfigStruct struct for parsing yaml & storing variables
+type smtpRelayConfigStruct struct {
+	Host          string `yaml:"host"`
+	Port          int    `yaml:"port"`
+	STARTTLS      bool   `yaml:"starttls"`
+	AllowInsecure bool   `yaml:"allow-insecure"`
+	Auth          string `yaml:"auth"`        // none, plain, cram-md5
+	Username      string `yaml:"username"`    // plain & cram-md5
+	Password      string `yaml:"password"`    // plain
+	Secret        string `yaml:"secret"`      // cram-md5
+	ReturnPath    string `yaml:"return-path"` // allows overriding the boune address
+}
+
 // VerifyConfig wil do some basic checking
 func VerifyConfig() error {
 	if DataFile != "" && isDir(DataFile) {
@ -167,7 +186,7 @@ func VerifyConfig() error {
 		if err != nil {
 			return err
 		}
-		SMTPAuth = a
+		SMTPAuthConfig = a
 	}

 	if SMTPTLSCert == "" && (SMTPAuthFile != "" || SMTPAuthAcceptAny) && !SMTPAuthAllowInsecure {
@ -182,7 +201,7 @@ func VerifyConfig() error {
 	s := strings.TrimRight(path.Join("/", Webroot, "/"), "/") + "/"
 	Webroot = s

-	SMTPTags = []Tag{}
+	SMTPTags = []AutoTag{}

 	p := shellwords.NewParser()

@ -203,14 +222,77 @@ func VerifyConfig() error {
 				if len(match) == 0 {
 					return fmt.Errorf("Invalid tag match (%s) - no search detected", tag)
 				}
-				SMTPTags = append(SMTPTags, Tag{Tag: tag, Match: match})
+				SMTPTags = append(SMTPTags, AutoTag{Tag: tag, Match: match})
 			} else {
 				return fmt.Errorf("Error parsing tags (%s)", a)
 			}
 		}
-
 	}

+	if err := parseRelayConfig(SMTPRelayConfigFile); err != nil {
+		return err
+	}
+
+	if !ReleaseEnabled && SMTPRelayAllIncoming {
+		return errors.New("SMTP relay config must be set to relay all messages")
+	}
+
+	if SMTPRelayAllIncoming {
+		// this deserves a warning
+		logger.Log().Warnf("[smtp] enabling automatic relay of all new messages via %s:%d", SMTPRelayConfig.Host, SMTPRelayConfig.Port)
+	}
+
+	return nil
+}
+
+// Parse & validate the SMTPRelayConfigFile (if set)
+func parseRelayConfig(c string) error {
+	if c == "" {
+		return nil
+	}
+
+	if !isFile(c) {
+		return fmt.Errorf("SMTP relay configuration not found: %s", SMTPRelayConfigFile)
+	}
+
+	data, err := os.ReadFile(c)
+	if err != nil {
+		return err
+	}
+
+	if err := yaml.Unmarshal(data, &SMTPRelayConfig); err != nil {
+		return err
+	}
+
+	if SMTPRelayConfig.Host == "" {
+		return errors.New("SMTP relay host not set")
+	}
+
+	if SMTPRelayConfig.Port == 0 {
+		SMTPRelayConfig.Port = 25 // default
+	}
+
+	SMTPRelayConfig.Auth = strings.ToLower(SMTPRelayConfig.Auth)
+
+	if SMTPRelayConfig.Auth == "" || SMTPRelayConfig.Auth == "none" || SMTPRelayConfig.Auth == "false" {
+		SMTPRelayConfig.Auth = "none"
+	} else if SMTPRelayConfig.Auth == "plain" {
+		if SMTPRelayConfig.Username == "" || SMTPRelayConfig.Password == "" {
+			return fmt.Errorf("SMTP relay host username or password not set for PLAIN authentication (%s)", c)
+		}
+	} else if strings.HasPrefix(SMTPRelayConfig.Auth, "cram") {
+		SMTPRelayConfig.Auth = "cram-md5"
+		if SMTPRelayConfig.Username == "" || SMTPRelayConfig.Secret == "" {
+			return fmt.Errorf("SMTP relay host username or secret not set for CRAM-MD5 authentication (%s)", c)
+		}
+	} else {
+		return fmt.Errorf("SMTP relay authentication method not supported: %s", SMTPRelayConfig.Auth)
+	}
+
+	ReleaseEnabled = true
+
+	logger.Log().Infof("[smtp] enabling message relaying via %s:%d", SMTPRelayConfig.Host, SMTPRelayConfig.Port)
+
 	return nil
 }

--- a/go.mod
+++ b/go.mod
@ -10,17 +10,18 @@ require (
 	github.com/gorilla/websocket v1.5.0
 	github.com/jhillyerd/enmime v0.11.1
 	github.com/k3a/html2text v1.1.0
-	github.com/klauspost/compress v1.16.3
-	github.com/leporo/sqlf v1.3.0
+	github.com/klauspost/compress v1.16.5
+	github.com/leporo/sqlf v1.4.0
 	github.com/mattn/go-shellwords v1.0.12
 	github.com/mhale/smtpd v0.8.0
 	github.com/satori/go.uuid v1.2.0
 	github.com/sirupsen/logrus v1.9.0
-	github.com/spf13/cobra v1.6.1
+	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
 	github.com/tg123/go-htpasswd v1.2.1
-	golang.org/x/text v0.8.0
-	modernc.org/sqlite v1.21.1
+	golang.org/x/text v0.9.0
+	gopkg.in/yaml.v3 v3.0.1
+	modernc.org/sqlite v1.21.2
 )

 require (
@ -43,17 +44,17 @@ require (
 	github.com/rivo/uniseg v0.4.4 // indirect
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	golang.org/x/crypto v0.7.0 // indirect
-	golang.org/x/image v0.6.0 // indirect
-	golang.org/x/mod v0.9.0 // indirect
-	golang.org/x/net v0.8.0 // indirect
-	golang.org/x/sys v0.6.0 // indirect
-	golang.org/x/tools v0.7.0 // indirect
+	golang.org/x/crypto v0.8.0 // indirect
+	golang.org/x/image v0.7.0 // indirect
+	golang.org/x/mod v0.10.0 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/tools v0.8.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	lukechampine.com/uint128 v1.3.0 // indirect
 	modernc.org/cc/v3 v3.40.0 // indirect
 	modernc.org/ccgo/v3 v3.16.13 // indirect
-	modernc.org/libc v1.22.3 // indirect
+	modernc.org/libc v1.22.4 // indirect
 	modernc.org/mathutil v1.5.0 // indirect
 	modernc.org/memory v1.5.0 // indirect
 	modernc.org/opt v0.1.3 // indirect
--- a/go.sum
+++ b/go.sum
@ -53,7 +53,6 @@ github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/jaytaylor/html2text v0.0.0-20230321000545-74c2419ad056 h1:iCHtR9CQyktQ5+f3dMVZfwD2KWJUgm7M0gdL9NGr8KA=
@ -66,8 +65,8 @@ github.com/k3a/html2text v1.1.0 h1:ks4hKSTdiTRsLr0DM771mI5TvsoG6zH7m1Ulv7eJRHw=
 github.com/k3a/html2text v1.1.0/go.mod h1:ieEXykM67iT8lTvEWBh6fhpH4B23kB9OMKPdIBmgUqA=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
-github.com/klauspost/compress v1.16.3 h1:XuJt9zzcnaz6a16/OU53ZjWp/v7/42WcR5t2a0PcNQY=
-github.com/klauspost/compress v1.16.3/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/klauspost/compress v1.16.5 h1:IFV2oUNUzZaz+XyusxpLzpzS8Pt5rh0Z16For/djlyI=
+github.com/klauspost/compress v1.16.5/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
 github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
@ -75,8 +74,8 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/leporo/sqlf v1.3.0 h1:nAkuPYxMIJg/sUmcd1h4avV5iYo8tBTGEGOIR4BIZO8=
-github.com/leporo/sqlf v1.3.0/go.mod h1:f4dHqIi1+nLl6k1IsNQ8QIEbGWK49th2ei1IxTXk+2E=
+github.com/leporo/sqlf v1.4.0 h1:SyWnX/8GSGOzVmanG0Ub1c04mR9nNl6Tq3IeFKX2/4c=
+github.com/leporo/sqlf v1.4.0/go.mod h1:pgN9yKsAnQ+2ewhbZogr98RcasUjPsHF3oXwPPhHvBw=
 github.com/mattn/go-isatty v0.0.18 h1:DOKFKCQ7FNG2L1rbrmstDN4QVRdS89Nkh85u68Uwp98=
 github.com/mattn/go-isatty v0.0.18/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
@ -84,8 +83,8 @@ github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWV
 github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-shellwords v1.0.12 h1:M2zGm7EW6UQJvDeQxo4T51eKPurbeFbe8WtebGE2xrk=
 github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=
-github.com/mattn/go-sqlite3 v1.14.10/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/go-sqlite3 v1.14.16 h1:yOQRA0RpS5PFz/oikGwBEqvAWhWg5ufRz4ETLjwpU1Y=
+github.com/mattn/go-sqlite3 v1.14.16/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mhale/smtpd v0.8.0 h1:5JvdsehCg33PQrZBvFyDMMUDQmvbzVpZgKob7eYBJc0=
 github.com/mhale/smtpd v0.8.0/go.mod h1:MQl+y2hwIEQCXtNhe5+55n0GZOjSmeqORDIXbqUL3x4=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
@ -111,15 +110,20 @@ github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykE
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIKYqbNC9s=
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
-github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
-github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf h1:pvbZ0lM0XWPBqUKqFU8cmavspvIl9nulOYwdy6IFRRo=
 github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf/go.mod h1:RJID2RhlZKId02nZ62WenDCkgHFerpIOmW0iT7GKmXM=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/tg123/go-htpasswd v1.2.1 h1:i4wfsX1KvvkyoMiHZzjS0VzbAPWfxzI8INcZAKtutoU=
 github.com/tg123/go-htpasswd v1.2.1/go.mod h1:erHp1B86KXdwQf1X5ZrLb7erXZnWueEQezb2dql4q58=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
@ -127,22 +131,22 @@ github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyC
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.7.0 h1:AvwMYaRytfdeVt3u6mLaxYtErKYjxA2OXjJ1HHq6t3A=
-golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
+golang.org/x/crypto v0.8.0 h1:pd9TJtTueMTVQXzk8E2XESSMQDj/U7OUu0PqJqPXQjQ=
+golang.org/x/crypto v0.8.0/go.mod h1:mRqEX+O9/h5TFCrQhkgjo2yKi0yYA+9ecGkdQoHrywE=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
-golang.org/x/image v0.6.0 h1:bR8b5okrPI3g/gyZakLZHeWxAR8Dn5CyxXv1hLH5g/4=
-golang.org/x/image v0.6.0/go.mod h1:MXLdDR43H7cDJq5GEGXEVeeNhPgi+YYEQ2pC1byI1x0=
+golang.org/x/image v0.7.0 h1:gzS29xtG1J5ybQlv0PuyfE3nmc6R4qB73m6LUUmvFuw=
+golang.org/x/image v0.7.0/go.mod h1:nd/q4ef1AKKYl/4kft7g+6UyGbdiqWqTP1ZAbRoV7Rg=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=
-golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
+golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
-golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
+golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
+golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
@ -154,8 +158,9 @@ golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@ -163,15 +168,15 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
-golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=
-golang.org/x/tools v0.7.0/go.mod h1:4pg6aUX35JBAogB10C9AtvVL+qowtN4pT3CGSQex14s=
+golang.org/x/tools v0.8.0 h1:vSDcovVPld282ceKgDimkRSC8kpaH1dgyc9UMzlt84Y=
+golang.org/x/tools v0.8.0/go.mod h1:JxBZ99ISMI5ViVkT1tr6tdNmXeTrcpVSD3vZ1RsRdN4=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@ -189,16 +194,16 @@ modernc.org/ccgo/v3 v3.16.13 h1:Mkgdzl46i5F/CNR/Kj80Ri59hC8TKAhZrYSaqvkwzUw=
 modernc.org/ccgo/v3 v3.16.13/go.mod h1:2Quk+5YgpImhPjv2Qsob1DnZ/4som1lJTodubIcoUkY=
 modernc.org/ccorpus v1.11.6 h1:J16RXiiqiCgua6+ZvQot4yUuUy8zxgqbqEEUuGPlISk=
 modernc.org/httpfs v1.0.6 h1:AAgIpFZRXuYnkjftxTAZwMIiwEqAfk8aVB2/oA6nAeM=
-modernc.org/libc v1.22.3 h1:D/g6O5ftAfavceqlLOFwaZuA5KYafKwmr30A6iSqoyY=
-modernc.org/libc v1.22.3/go.mod h1:MQrloYP209xa2zHome2a8HLiLm6k0UT8CoHpV74tOFw=
+modernc.org/libc v1.22.4 h1:wymSbZb0AlrjdAVX3cjreCHTPCpPARbQXNz6BHPzdwQ=
+modernc.org/libc v1.22.4/go.mod h1:jj+Z7dTNX8fBScMVNRAYZ/jF91K8fdT2hYMThc3YjBY=
 modernc.org/mathutil v1.5.0 h1:rV0Ko/6SfM+8G+yKiyI830l3Wuz1zRutdslNoQ0kfiQ=
 modernc.org/mathutil v1.5.0/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
 modernc.org/memory v1.5.0 h1:N+/8c5rE6EqugZwHii4IFsaJ7MUhoWX07J5tC/iI5Ds=
 modernc.org/memory v1.5.0/go.mod h1:PkUhL0Mugw21sHPeskwZW4D6VscE/GQJOnIpCnW6pSU=
 modernc.org/opt v0.1.3 h1:3XOZf2yznlhC+ibLltsDGzABUGVx8J6pnFMS3E4dcq4=
 modernc.org/opt v0.1.3/go.mod h1:WdSiB5evDcignE70guQKxYUl14mgWtbClRi5wmkkTX0=
-modernc.org/sqlite v1.21.1 h1:GyDFqNnESLOhwwDRaHGdp2jKLDzpyT/rNLglX3ZkMSU=
-modernc.org/sqlite v1.21.1/go.mod h1:XwQ0wZPIh1iKb5mkvCJ3szzbhk+tykC8ZWqTRTgYRwI=
+modernc.org/sqlite v1.21.2 h1:ixuUG0QS413Vfzyx6FWx6PYTmHaOegTY+hjzhn7L+a0=
+modernc.org/sqlite v1.21.2/go.mod h1:cxbLkB5WS32DnQqeH4h4o1B0eMr8W/y8/RGuxQ3JsC0=
 modernc.org/strutil v1.1.3 h1:fNMm+oJklMGYfU9Ylcywl0CO5O6nTfaowNsh2wpPjzY=
 modernc.org/strutil v1.1.3/go.mod h1:MEHNA7PdEnEwLvspRMtWTNnp2nnyvMfkimT1NKNAGbw=
 modernc.org/tcl v1.15.1 h1:mOQwiEK4p7HruMZcwKTZPw/aqtGM4aY00uzWhlKKYws=
--- a/package-lock.json
+++ b/package-lock.json
--- a/sendmail/cmd/cmd.go
+++ b/sendmail/cmd/cmd.go
@ -1,3 +1,4 @@
+// Package cmd is the sendmail cli
 package cmd

 /**
@ -13,10 +14,18 @@ import (
 	"os"
 	"os/user"

+	"github.com/axllent/mailpit/config"
 	"github.com/axllent/mailpit/utils/logger"
 	flag "github.com/spf13/pflag"
 )

+var (
+	// Verbose flag
+	Verbose bool
+
+	fromAddr string
+)
+
 // Run the Mailpit sendmail replacement.
 func Run() {
 	host, err := os.Hostname()
@ -30,7 +39,10 @@ func Run() {
 		username = user.Username
 	}

-	fromAddr := username + "@" + host
+	if fromAddr == "" {
+		fromAddr = username + "@" + host
+	}
+
 	smtpAddr := "localhost:1025"
 	var recip []string

@ -42,25 +54,32 @@ func Run() {
 		fromAddr = os.Getenv("MP_SENDMAIL_FROM")
 	}

-	var verbose bool
-
 	// override defaults from cli flags
-	flag.StringVarP(&fromAddr, "from", "f", fromAddr, "SMTP sender")
+	flag.StringVarP(&fromAddr, "from", "f", fromAddr, "SMTP sender address")
 	flag.StringVar(&smtpAddr, "smtp-addr", smtpAddr, "SMTP server address")
-	flag.BoolVarP(&verbose, "verbose", "v", false, "Verbose mode (sends debug output to stderr)")
+	flag.BoolVarP(&Verbose, "verbose", "v", false, "Verbose mode (sends debug output to stderr)")
 	flag.BoolP("long-b", "b", false, "Ignored. This flag exists for sendmail compatibility.")
 	flag.BoolP("long-i", "i", false, "Ignored. This flag exists for sendmail compatibility.")
 	flag.BoolP("long-o", "o", false, "Ignored. This flag exists for sendmail compatibility.")
 	flag.BoolP("long-s", "s", false, "Ignored. This flag exists for sendmail compatibility.")
 	flag.BoolP("long-t", "t", false, "Ignored. This flag exists for sendmail compatibility.")
 	flag.CommandLine.SortFlags = false
+
+	// set the default help
+	flag.Usage = func() {
+		fmt.Printf("A sendmail command replacement for Mailpit (%s).\n\n", config.Version)
+		fmt.Printf("Usage:\n %s [flags] [recipients]\n", os.Args[0])
+		fmt.Println("\nFlags:")
+		flag.PrintDefaults()
+	}
+
 	flag.Parse()

 	// allow recipient to be passed as an argument
 	recip = flag.Args()

-	if verbose {
-		fmt.Fprintln(os.Stderr, smtpAddr, fromAddr)
+	if Verbose {
+		fmt.Fprintln(os.Stdout, smtpAddr, fromAddr)
 	}

 	body, err := ioutil.ReadAll(os.Stdin)
@ -75,13 +94,30 @@ func Run() {
 		os.Exit(11)
 	}

-	if len(recip) == 0 {
-		// We only need to parse the message to get a recipient if none where
-		// provided on the command line.
-		recip = append(recip, msg.Header.Get("To"))
+	addresses := []string{}
+
+	if len(recip) > 0 {
+		addresses = recip
+	} else {
+		// get all recipients in To, Cc and Bcc
+		if to, err := msg.Header.AddressList("To"); err == nil {
+			for _, a := range to {
+				addresses = append(addresses, a.Address)
+			}
+		}
+		if cc, err := msg.Header.AddressList("Cc"); err == nil {
+			for _, a := range cc {
+				addresses = append(addresses, a.Address)
+			}
+		}
+		if bcc, err := msg.Header.AddressList("Bcc"); err == nil {
+			for _, a := range bcc {
+				addresses = append(addresses, a.Address)
+			}
+		}
 	}

-	err = smtp.SendMail(smtpAddr, nil, fromAddr, recip, body)
+	err = smtp.SendMail(smtpAddr, nil, fromAddr, addresses, body)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "error sending mail")
 		logger.Log().Fatal(err)
--- a/server/apiv1/api.go
+++ b/server/apiv1/api.go
@ -10,8 +10,12 @@ import (
 	"strings"

 	"github.com/axllent/mailpit/config"
+	"github.com/axllent/mailpit/server/smtpd"
 	"github.com/axllent/mailpit/storage"
+	"github.com/axllent/mailpit/utils/logger"
+	"github.com/axllent/mailpit/utils/tools"
 	"github.com/gorilla/mux"
+	uuid "github.com/satori/go.uuid"
 )

 // GetMessages returns a paginated list of messages as JSON
@ -491,6 +495,121 @@ func SetTags(w http.ResponseWriter, r *http.Request) {
 	_, _ = w.Write([]byte("ok"))
 }

+// ReleaseMessage (method: POST) will release a message via a preconfigured external SMTP server.
+// If no IDs are provided then all messages are updated.
+func ReleaseMessage(w http.ResponseWriter, r *http.Request) {
+	// swagger:route POST /api/v1/message/{ID}/release message Release
+	//
+	// # Release message
+	//
+	// Release a message via a preconfigured external SMTP server..
+	//
+	//	Consumes:
+	//	- application/json
+	//
+	//	Produces:
+	//	- text/plain
+	//
+	//	Schemes: http, https
+	//
+	//	Parameters:
+	//	  + name: ID
+	//	    in: path
+	//	    description: message id
+	//	    required: true
+	//	    type: string
+	//		+ name: To
+	//	    in: body
+	//	    description: Array of email addresses to release message to
+	//	    required: true
+	//	    type: ReleaseMessageRequest
+	//
+	//	Responses:
+	//		200: OKResponse
+	//		default: ErrorResponse
+
+	vars := mux.Vars(r)
+
+	id := vars["id"]
+
+	msg, err := storage.GetMessageRaw(id)
+	if err != nil {
+		fourOFour(w)
+		return
+	}
+
+	decoder := json.NewDecoder(r.Body)
+
+	data := releaseMessageRequest{}
+
+	if err := decoder.Decode(&data); err != nil {
+		httpError(w, err.Error())
+		return
+	}
+
+	tos := data.To
+	if len(tos) == 0 {
+		httpError(w, "No valid addresses found")
+		return
+	}
+
+	for _, to := range tos {
+		if _, err := mail.ParseAddress(to); err != nil {
+			httpError(w, "Invalid email address: "+to)
+			return
+		}
+	}
+
+	reader := bytes.NewReader(msg)
+	m, err := mail.ReadMessage(reader)
+	if err != nil {
+		httpError(w, err.Error())
+		return
+	}
+
+	froms, err := m.Header.AddressList("From")
+	if err != nil {
+		httpError(w, err.Error())
+		return
+	}
+
+	from := froms[0].Address
+
+	// if sender is used, then change from to the sender
+	if senders, err := m.Header.AddressList("Sender"); err == nil {
+		from = senders[0].Address
+	}
+
+	msg, err = tools.RemoveMessageHeaders(msg, []string{"Bcc", "Message-Id"})
+	if err != nil {
+		httpError(w, err.Error())
+		return
+	}
+
+	if config.SMTPRelayConfig.ReturnPath != "" && m.Header.Get("Return-Path") != "<"+config.SMTPRelayConfig.ReturnPath+">" {
+		msg, err = tools.RemoveMessageHeaders(msg, []string{"Return-Path"})
+		if err != nil {
+			httpError(w, err.Error())
+			return
+		}
+		msg = append([]byte("Return-Path: <"+config.SMTPRelayConfig.ReturnPath+">\r\n"), msg...)
+	}
+
+	// generate unique ID
+	uid := uuid.NewV4().String() + "@mailpit"
+	// add unique ID
+	msg = append([]byte("Message-Id: <"+uid+">\r\n"), msg...)
+
+	if err := smtpd.Send(from, tos, msg); err != nil {
+		logger.Log().Errorf("[smtp] error sending message: %s", err.Error())
+		httpError(w, "SMTP error: "+err.Error())
+		return
+	}
+
+	w.Header().Add("Content-Type", "text/plain")
+	_, _ = w.Write([]byte("ok"))
+}
+
 // FourOFour returns a basic 404 message
 func fourOFour(w http.ResponseWriter) {
 	w.Header().Set("Referrer-Policy", "no-referrer")
--- a/server/apiv1/info.go
+++ b/server/apiv1/info.go
@ -11,7 +11,7 @@ import (
 	"github.com/axllent/mailpit/utils/updater"
 )

-// Response includes the current and latest Mailpit versions, database info, and memory usage
+// Response includes the current and latest Mailpit version, database info, and memory usage
 //
 // swagger:model AppInformation
 type appInformation struct {
@ -33,12 +33,12 @@ type appInformation struct {
 func AppInfo(w http.ResponseWriter, r *http.Request) {
 	// swagger:route GET /api/v1/info application AppInformation
 	//
-	// # Get the application information
+	// # Get application information
 	//
 	// Returns basic runtime information, message totals and latest release version.
 	//
 	//	Produces:
-	//	- application/octet-stream
+	//	- application/json
 	//
 	//	Schemes: http, https
 	//
--- a/server/apiv1/swagger.go
+++ b/server/apiv1/swagger.go
@ -9,6 +9,13 @@ type infoResponse struct {
 	Body appInformation
 }

+// Web UI configuration
+// swagger:response WebUIConfigurationResponse
+type webUIConfigurationResponse struct {
+	// Web UI configuration settings
+	Body webUIConfiguration
+}
+
 // Message summary
 // swagger:response MessagesSummaryResponse
 type messagesSummaryResponse struct {
@ -47,11 +54,19 @@ type setTagsRequest struct {
 	// in:body
 	Tags []string `json:"tags"`

-	// ids
+	// IDs
 	// in:body
 	IDs []string `json:"ids"`
 }

+// Release request
+// swagger:model ReleaseMessageRequest
+type releaseMessageRequest struct {
+	// To
+	// in:body
+	To []string `json:"to"`
+}
+
 // Binary data reponse inherits the attachment's content type
 // swagger:response BinaryResponse
 type binaryResponse struct {
--- a/server/apiv1/webui.go
+++ b/server/apiv1/webui.go
@ -0,0 +1,54 @@
+package apiv1
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/axllent/mailpit/config"
+)
+
+// Response includes global web UI settings
+//
+// swagger:model WebUIConfiguration
+type webUIConfiguration struct {
+	// Message Relay information
+	MessageRelay struct {
+		// Whether message relaying (release) is enabled
+		Enabled bool
+		// The configured SMTP server address
+		SMTPServer string
+		// Enforced Return-Path (if set) for relay bounces
+		ReturnPath string
+	}
+}
+
+// WebUIConfig returns configuration settings for the web UI.
+func WebUIConfig(w http.ResponseWriter, r *http.Request) {
+	// swagger:route GET /api/v1/webui application WebUIConfiguration
+	//
+	// # Get web UI configuration
+	//
+	// Returns configuration settings for the web UI.
+	//
+	//	Produces:
+	//	- application/json
+	//
+	//	Schemes: http, https
+	//
+	//	Responses:
+	//		200: WebUIConfigurationResponse
+	//		default: ErrorResponse
+	conf := webUIConfiguration{}
+
+	conf.MessageRelay.Enabled = config.ReleaseEnabled
+	if config.ReleaseEnabled {
+		conf.MessageRelay.SMTPServer = fmt.Sprintf("%s:%d", config.SMTPRelayConfig.Host, config.SMTPRelayConfig.Port)
+		conf.MessageRelay.ReturnPath = config.SMTPRelayConfig.ReturnPath
+	}
+
+	bytes, _ := json.Marshal(conf)
+
+	w.Header().Add("Content-Type", "application/json")
+	_, _ = w.Write(bytes)
+}
--- a/server/server.go
+++ b/server/server.go
@ -1,3 +1,4 @@
+// Package server is the HTTP daemon
 package server

 import (
@ -21,6 +22,9 @@ import (
 //go:embed ui
 var embeddedFS embed.FS

+// AccessControlAllowOrigin CORS policy
+var AccessControlAllowOrigin string
+
 // Listen will start the httpd
 func Listen() {
 	isReady := &atomic.Value{}
@ -87,6 +91,7 @@ func defaultRoutes() *mux.Router {
 	r.HandleFunc(config.Webroot+"api/v1/message/{id}/headers", middleWareFunc(apiv1.GetHeaders)).Methods("GET")
 	r.HandleFunc(config.Webroot+"api/v1/message/{id}", middleWareFunc(apiv1.GetMessage)).Methods("GET")
 	r.HandleFunc(config.Webroot+"api/v1/info", middleWareFunc(apiv1.AppInfo)).Methods("GET")
+	r.HandleFunc(config.Webroot+"api/v1/webui", middleWareFunc(apiv1.WebUIConfig)).Methods("GET")

 	return r
 }
@ -114,6 +119,10 @@ func middleWareFunc(fn http.HandlerFunc) http.HandlerFunc {
 		w.Header().Set("Referrer-Policy", "no-referrer")
 		w.Header().Set("Content-Security-Policy", config.ContentSecurityPolicy)

+		if AccessControlAllowOrigin != "" && strings.HasPrefix(r.RequestURI, config.Webroot+"api/") {
+			w.Header().Set("Access-Control-Allow-Origin", AccessControlAllowOrigin)
+		}
+
 		if config.UIAuthFile != "" {
 			user, pass, ok := r.BasicAuth()

@ -147,6 +156,10 @@ func middlewareHandler(h http.Handler) http.Handler {
 		w.Header().Set("Referrer-Policy", "no-referrer")
 		w.Header().Set("Content-Security-Policy", config.ContentSecurityPolicy)

+		if AccessControlAllowOrigin != "" && strings.HasPrefix(r.RequestURI, config.Webroot+"api/") {
+			w.Header().Set("Access-Control-Allow-Origin", AccessControlAllowOrigin)
+		}
+
 		if config.UIAuthFile != "" {
 			user, pass, ok := r.BasicAuth()

--- a/server/server_test.go
+++ b/server/server_test.go
@ -14,6 +14,7 @@ import (
 	"github.com/axllent/mailpit/config"
 	"github.com/axllent/mailpit/server/apiv1"
 	"github.com/axllent/mailpit/storage"
+	"github.com/axllent/mailpit/utils/logger"
 	"github.com/jhillyerd/enmime"
 )

@ -150,7 +151,7 @@ func Test_APIv1(t *testing.T) {
 }

 func setup() {
-	config.NoLogging = true
+	logger.NoLogging = true
 	config.MaxMessages = 0
 	config.DataFile = ""

--- a/server/smtpd/smtp.go
+++ b/server/smtpd/smtp.go
@ -0,0 +1,71 @@
+package smtpd
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net/smtp"
+
+	"github.com/axllent/mailpit/config"
+)
+
+// Send will connect to a pre-configured SMTP server and send a message to one or more recipients.
+func Send(from string, to []string, msg []byte) error {
+	addr := fmt.Sprintf("%s:%d", config.SMTPRelayConfig.Host, config.SMTPRelayConfig.Port)
+
+	c, err := smtp.Dial(addr)
+	if err != nil {
+		return err
+	}
+
+	defer c.Close()
+
+	if config.SMTPRelayConfig.STARTTLS {
+		conf := &tls.Config{ServerName: config.SMTPRelayConfig.Host}
+
+		conf.InsecureSkipVerify = config.SMTPRelayConfig.AllowInsecure
+
+		if err = c.StartTLS(conf); err != nil {
+			return err
+		}
+	}
+
+	var a smtp.Auth
+
+	if config.SMTPRelayConfig.Auth == "plain" {
+		a = smtp.PlainAuth("", config.SMTPRelayConfig.Username, config.SMTPRelayConfig.Password, config.SMTPRelayConfig.Host)
+	}
+
+	if config.SMTPRelayConfig.Auth == "cram-md5" {
+		a = smtp.CRAMMD5Auth(config.SMTPRelayConfig.Username, config.SMTPRelayConfig.Secret)
+	}
+
+	if a != nil {
+		if err = c.Auth(a); err != nil {
+			return err
+		}
+	}
+	if err = c.Mail(from); err != nil {
+		return err
+	}
+
+	for _, addr := range to {
+		if err = c.Rcpt(addr); err != nil {
+			return err
+		}
+	}
+
+	w, err := c.Data()
+	if err != nil {
+		return err
+	}
+
+	if _, err := w.Write(msg); err != nil {
+		return err
+	}
+
+	if err := w.Close(); err != nil {
+		return err
+	}
+
+	return c.Quit()
+}
--- a/server/smtpd/smtpd.go
+++ b/server/smtpd/smtpd.go
@ -3,6 +3,7 @@ package smtpd

 import (
 	"bytes"
+	"fmt"
 	"net"
 	"net/mail"
 	"regexp"
@ -12,46 +13,101 @@ import (
 	"github.com/axllent/mailpit/storage"
 	"github.com/axllent/mailpit/utils/logger"
 	"github.com/mhale/smtpd"
+	uuid "github.com/satori/go.uuid"
 )

 func mailHandler(origin net.Addr, from string, to []string, data []byte) error {
 	msg, err := mail.ReadMessage(bytes.NewReader(data))
 	if err != nil {
-		logger.Log().Errorf("error parsing message: %s", err.Error())
+		logger.Log().Errorf("[smtpd] error parsing message: %s", err.Error())
+
 		return err
 	}

-	if _, err := storage.Store(data); err != nil {
-		// Value with size 4800709 exceeded 1048576 limit
-		re := regexp.MustCompile(`(Value with size \d+ exceeded \d+ limit)`)
-		tooLarge := re.FindStringSubmatch(err.Error())
-		if len(tooLarge) > 0 {
-			logger.Log().Errorf("[db] error storing message: %s", tooLarge[0])
+	// add a message ID if not set
+	if msg.Header.Get("Message-Id") == "" {
+		// generate unique ID
+		uid := uuid.NewV4().String() + "@mailpit"
+		// add unique ID
+		data = append([]byte("Message-Id: <"+uid+">\r\n"), data...)
+	}
+
+	// if enabled, this will route the email 1:1 through to the preconfigured smtp server
+	if config.SMTPRelayAllIncoming {
+		if err := Send(from, to, data); err != nil {
+			logger.Log().Errorf("[smtp] error relaying message: %s", err.Error())
 		} else {
-			logger.Log().Errorf("[db] error storing message")
-			logger.Log().Errorf(err.Error())
+			logger.Log().Debugf("[smtp] relayed message from %s via %s:%d", from, config.SMTPRelayConfig.Host, config.SMTPRelayConfig.Port)
 		}
+	}
+
+	// build array of all addresses in the header to compare to the []to array
+	emails, hasBccHeader := scanAddressesInHeader(msg.Header)
+
+	missingAddresses := []string{}
+	for _, a := range to {
+		// loop through passed email addresses to check if they are in the headers
+		if _, err := mail.ParseAddress(a); err == nil {
+			_, ok := emails[strings.ToLower(a)]
+			if !ok {
+				missingAddresses = append(missingAddresses, a)
+			}
+		} else {
+			logger.Log().Warnf("[smtpd] ignoring invalid email address: %s", a)
+		}
+	}
+
+	// add missing email addresses to Bcc (eg: Laravel doesn't include these in the headers)
+	if len(missingAddresses) > 0 {
+		if hasBccHeader {
+			// email already has Bcc header, add to existing addresses
+			re := regexp.MustCompile(`(?i)(^|\n)(Bcc: )`)
+			replaced := false
+			data = re.ReplaceAllFunc(data, func(r []byte) []byte {
+				if replaced {
+					return r
+				}
+				replaced = true // only replace first occurence
+
+				return re.ReplaceAll(r, []byte("${1}Bcc: "+strings.Join(missingAddresses, ", ")+", "))
+			})
+
+		} else {
+			// prepend new Bcc header
+			bcc := []byte(fmt.Sprintf("Bcc: %s\r\n", strings.Join(missingAddresses, ", ")))
+			data = append(bcc, data...)
+		}
+
+		logger.Log().Debugf("[smtpd] added missing addresses to Bcc header: %s", strings.Join(missingAddresses, ", "))
+	}
+
+	if _, err := storage.Store(data); err != nil {
+		logger.Log().Errorf("[db] error storing message: %d", err.Error())
+
 		return err
 	}

 	subject := msg.Header.Get("Subject")
-	logger.Log().Debugf("[smtp] received (%s) from:%s to:%s subject:%q", cleanIP(origin), from, to[0], subject)
+	logger.Log().Debugf("[smtpd] received (%s) from:%s subject:%q", cleanIP(origin), from, subject)
+
 	return nil
 }

 func authHandler(remoteAddr net.Addr, mechanism string, username []byte, password []byte, shared []byte) (bool, error) {
-	allow := config.SMTPAuth.Match(string(username), string(password))
+	allow := config.SMTPAuthConfig.Match(string(username), string(password))
 	if allow {
-		logger.Log().Debugf("[smtp] allow %s login:%q from:%s", mechanism, string(username), cleanIP(remoteAddr))
+		logger.Log().Debugf("[smtpd] allow %s login:%q from:%s", mechanism, string(username), cleanIP(remoteAddr))
 	} else {
-		logger.Log().Warnf("[smtp] deny %s login:%q from:%s", mechanism, string(username), cleanIP(remoteAddr))
+		logger.Log().Warnf("[smtpd] deny %s login:%q from:%s", mechanism, string(username), cleanIP(remoteAddr))
 	}
+
 	return allow, nil
 }

 // Allow any username and password
 func authHandlerAny(remoteAddr net.Addr, mechanism string, username []byte, password []byte, shared []byte) (bool, error) {
-	logger.Log().Debugf("[smtp] allow %s login %q from %s", mechanism, string(username), cleanIP(remoteAddr))
+	logger.Log().Debugf("[smtpd] allow %s login %q from %s", mechanism, string(username), cleanIP(remoteAddr))
+
 	return true, nil
 }

@ -59,19 +115,19 @@ func authHandlerAny(remoteAddr net.Addr, mechanism string, username []byte, pass
 func Listen() error {
 	if config.SMTPAuthAllowInsecure {
 		if config.SMTPAuthFile != "" {
-			logger.Log().Infof("[smtp] enabling login auth via %s (insecure)", config.SMTPAuthFile)
+			logger.Log().Infof("[smtpd] enabling login auth via %s (insecure)", config.SMTPAuthFile)
 		} else if config.SMTPAuthAcceptAny {
-			logger.Log().Info("[smtp] enabling all auth (insecure)")
+			logger.Log().Info("[smtpd] enabling all auth (insecure)")
 		}
 	} else {
 		if config.SMTPAuthFile != "" {
-			logger.Log().Infof("[smtp] enabling login auth via %s (TLS)", config.SMTPAuthFile)
+			logger.Log().Infof("[smtpd] enabling login auth via %s (TLS)", config.SMTPAuthFile)
 		} else if config.SMTPAuthAcceptAny {
-			logger.Log().Info("[smtp] enabling any auth (TLS)")
+			logger.Log().Info("[smtpd] enabling any auth (TLS)")
 		}
 	}

-	logger.Log().Infof("[smtp] starting on %s", logger.CleanIP(config.SMTPListen))
+	logger.Log().Infof("[smtpd] starting on %s", logger.CleanIP(config.SMTPListen))

 	return listenAndServe(config.SMTPListen, mailHandler, authHandler)
 }
@ -113,3 +169,33 @@ func cleanIP(i net.Addr) string {

 	return parts[0]
 }
+
+// Returns a list of all lowercased emails found in To, Cc and Bcc,
+// as well as whether there is a Bcc field
+func scanAddressesInHeader(h mail.Header) (map[string]bool, bool) {
+	emails := make(map[string]bool)
+	hasBccHeader := false
+
+	if recipients, err := h.AddressList("To"); err == nil {
+		for _, r := range recipients {
+			emails[strings.ToLower(r.Address)] = true
+		}
+	}
+
+	if recipients, err := h.AddressList("Cc"); err == nil {
+		for _, r := range recipients {
+			emails[strings.ToLower(r.Address)] = true
+		}
+	}
+
+	recipients, err := h.AddressList("Bcc")
+	if err == nil {
+		for _, r := range recipients {
+			emails[strings.ToLower(r.Address)] = true
+		}
+
+		hasBccHeader = true
+	}
+
+	return emails, hasBccHeader
+}
--- a/server/ui-src/App.vue
+++ b/server/ui-src/App.vue
@ -2,6 +2,7 @@
 import commonMixins from './mixins.js';
 import Message from './templates/Message.vue';
 import MessageSummary from './templates/MessageSummary.vue';
+import MessageRelease from './templates/MessageRelease.vue';
 import moment from 'moment';
 import Tinycon from 'tinycon';

@ -10,7 +11,8 @@ export default {

 	components: {
 		Message,
-		MessageSummary
+		MessageSummary,
+		MessageRelease
 	},

 	data() {
@ -36,7 +38,9 @@ export default {
 			selected: [],
 			tcStatus: 0,
 			appInfo: false,
-			lastLoaded: false
+			lastLoaded: false,
+			relayConfig: {},
+			releaseAddresses: false,
 		}
 	},

@ -87,6 +91,7 @@ export default {
 		});

 		this.connect();
+		this.getUISettings();
 		this.loadMessages();
 	},

@ -147,6 +152,13 @@ export default {
 			});
 		},

+		getUISettings: function () {
+			let self = this;
+			self.get('api/v1/webui', null, function (response) {
+				self.relayConfig = response.data;
+			});
+		},
+
 		doSearch: function (e) {
 			e.preventDefault();
 			this.loadMessages();
@ -192,6 +204,7 @@ export default {
 		openMessage: function (id) {
 			let self = this;
 			self.selected = [];
+			self.releaseAddresses = false;
 			self.existingTags = JSON.parse(JSON.stringify(self.tags));

 			let uri = 'api/v1/message/' + self.currentPath
@ -550,6 +563,34 @@ export default {
 			dl.target = '_blank';
 			dl.download = this.message.ID + '.' + ext;
 			dl.click();
+		},
+
+		initReleaseModal: function () {
+			this.releaseAddresses = false;
+			let addresses = [];
+			for (let i in this.message.To) {
+				addresses.push(this.message.To[i].Address)
+			}
+			for (let i in this.message.Cc) {
+				addresses.push(this.message.Cc[i].Address)
+			}
+			for (let i in this.message.Bcc) {
+				addresses.push(this.message.Bcc[i].Address)
+			}
+
+			// include only unique email addresses, regardless of casing
+			let uAddresses = new Map(addresses.map(a => [a.toLowerCase(), a]));
+			this.releaseAddresses = [...uAddresses.values()];
+
+			let self = this;
+			window.setTimeout(function () {
+				// delay to allow elements to load
+				self.modal('ReleaseModal').show();
+
+				window.setTimeout(function () {
+					document.querySelector('#ReleaseModal input[role="combobox"]').focus()
+				}, 500);
+			}, 300);
 		}
 	}
 }
@ -572,6 +613,10 @@ export default {
 			<button class="btn btn-outline-light me-2" title="Mark unread" v-on:click="markUnread">
 				<i class="bi bi-eye-slash"></i> <span class="d-none d-md-inline">Mark unread</span>
 			</button>
+			<button class="btn btn-outline-light me-2" title="Release message"
+				v-if="relayConfig.MessageRelay && relayConfig.MessageRelay.Enabled" v-on:click="initReleaseModal">
+				<i class="bi bi-send"></i> <span class="d-none d-md-inline">Release</span>
+			</button>
 			<button class="btn btn-outline-light me-2" title="Delete message" v-on:click="deleteMessages">
 				<i class="bi bi-trash-fill"></i> <span class="d-none d-md-inline">Delete</span>
 			</button>
@ -963,4 +1008,10 @@ export default {
 			</div>
 		</div>
 	</div>
+
+	<!-- Modal -->
+	<div class="modal fade" id="ReleaseModal" tabindex="-1" aria-labelledby="AppInfoModalLabel" aria-hidden="true">
+		<MessageRelease v-if="releaseAddresses" :message="message" :relayConfig="relayConfig"
+			:releaseAddresses="releaseAddresses"></MessageRelease>
+	</div>
 </template>
--- a/server/ui-src/assets/styles.scss
+++ b/server/ui-src/assets/styles.scss
@ -251,6 +251,10 @@ body.blur {
    input {
        font-size: 0.875em;
    }
+
+    div {
+        cursor: text; // html5-tags
+    }
 }

 #DownloadBtn {
@ -264,6 +268,14 @@ body.blur {
    }
 }

+#ReleaseModal {
+    .form-control.dropdown {
+        div {
+            @extend .form-control;
+        }
+    }
+}
+
 /* PrismJS 1.29.0 - modified!
 https://prismjs.com/download.html#themes=prism-coy&languages=markup+css */
 code[class*="language-"],
--- a/server/ui-src/templates/Message.vue
+++ b/server/ui-src/templates/Message.vue
@ -211,7 +211,8 @@ export default {
 							<td class="privacy">
 								<span v-for="(t, i) in message.Bcc">
 									<template v-if="i > 0">,</template>
-									{{ t.Name + " &lt;" + t.Address + "&gt;" }} </span>
+									{{ t.Name + " &lt;" + t.Address + "&gt;" }}
+								</span>
 							</td>
 						</tr>
 						<tr v-if="message.ReplyTo && message.ReplyTo.length" class="small">
@ -222,9 +223,16 @@ export default {
 									{{ t.Name + " &lt;" + t.Address + "&gt;" }} </span>
 							</td>
 						</tr>
+						<tr v-if="message.ReturnPath && message.ReturnPath != message.From.Address" class="small">
+							<th class="text-nowrap">Return-Path</th>
+							<td class="privacy text-muted">&lt;{{ message.ReturnPath }}&gt;</td>
+						</tr>
 						<tr>
 							<th class="small">Subject</th>
-							<td><strong>{{ message.Subject }}</strong></td>
+							<td>
+								<strong v-if="message.Subject != ''">{{ message.Subject }}</strong>
+								<small class="text-muted" v-else>[ no subject ]</small>
+							</td>
 						</tr>
 						<tr class="d-md-none small">
 							<th class="small">Date</th>
@ -262,7 +270,7 @@ export default {
 			<div class="nav nav-tabs my-3" id="nav-tab" role="tablist">
 				<button class="nav-link" id="nav-html-tab" data-bs-toggle="tab" data-bs-target="#nav-html" type="button"
 					role="tab" aria-controls="nav-html" aria-selected="true" v-if="message.HTML"
-					v-on:click="showMobileBtns = true">HTML</button>
+					v-on:click="showMobileBtns = true; resizeIframes()">HTML</button>
 				<button class="nav-link" id="nav-html-source-tab" data-bs-toggle="tab" data-bs-target="#nav-html-source"
 					type="button" role="tab" aria-controls="nav-html-source" aria-selected="false" v-if="message.HTML"
 					v-on:click="showMobileBtns = false">
--- a/server/ui-src/templates/MessageRelease.vue
+++ b/server/ui-src/templates/MessageRelease.vue
@ -0,0 +1,109 @@
+
+<script>
+import Tags from "bootstrap5-tags";
+import commonMixins from '../mixins.js';
+
+export default {
+	props: {
+		message: Object,
+		relayConfig: Object,
+		releaseAddresses: Array
+	},
+
+	data() {
+		return {
+			addresses: []
+		}
+	},
+
+	mixins: [commonMixins],
+
+	mounted() {
+		this.addresses = JSON.parse(JSON.stringify(this.releaseAddresses));
+		this.$nextTick(function () {
+			Tags.init("select[multiple]");
+		});
+	},
+
+	methods: {
+		releaseMessage: function () {
+			let self = this;
+			// set timeout to allow for user clicking send before the tag filter has applied the tag
+			window.setTimeout(function () {
+				if (!self.addresses.length) {
+					return false;
+				}
+
+				let data = {
+					to: self.addresses
+				}
+
+				self.post('api/v1/message/' + self.message.ID + '/release', data, function (response) {
+					self.modal("ReleaseModal").hide();
+				});
+			}, 100);
+		}
+	}
+}
+</script>
+
+<template>
+	<div class="modal-dialog modal-lg" v-if="message">
+		<div class="modal-content">
+			<div class="modal-header">
+				<h1 class="modal-title fs-5" id="AppInfoModalLabel">Release email</h1>
+				<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+			</div>
+			<div class="modal-body">
+				<h6>Send this message to one or more addresses specified below.</h6>
+				<div class="row">
+					<label class="col-sm-2 col-form-label text-muted">From</label>
+					<div class="col-sm-10">
+						<input type="text" readonly class="form-control-plaintext" :value="message.From.Address">
+					</div>
+				</div>
+				<div class="row">
+					<label class=" col-sm-2 col-form-label text-muted">Subject</label>
+					<div class="col-sm-10">
+						<input type="text" readonly class="form-control-plaintext" :value="message.Subject">
+					</div>
+				</div>
+				<div class="row mb-3">
+					<label class="col-sm-2 col-form-label text-muted">Send to</label>
+					<div class="col-sm-10">
+						<select class="form-select tag-selector" v-model="addresses" multiple data-allow-new="true"
+							data-clear-end="true" data-allow-clear="true" data-placeholder="Enter email addresses..."
+							data-add-on-blur="true" data-badge-style="primary"
+							data-regex='^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|.(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$'
+							data-separator="|,|">
+							<option value="">Enter email addresses...</option>
+							<!-- you need at least one option with the placeholder -->
+							<option v-for="t in releaseAddresses" :value="t">{{ t }}</option>
+						</select>
+						<div class="invalid-feedback">Invalid email address</div>
+					</div>
+				</div>
+				<div class="form-text text-center">
+					Note: For testing purposes, a unique Message-Id will be generated on send.
+					<br class="d-none d-md-inline">
+					SMTP delivery failures will bounce back to
+					<b v-if="relayConfig.MessageRelay.ReturnPath != ''">{{ relayConfig.MessageRelay.ReturnPath }}</b>
+					<b v-else>{{ message.ReturnPath }}</b>.
+				</div>
+			</div>
+			<div class="modal-footer">
+				<button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
+				<button type="button" class="btn btn-primary" :disabled="!addresses.length"
+					v-on:click="releaseMessage">Release</button>
+			</div>
+		</div>
+	</div>
+
+	<div id="loading" v-if="loading">
+		<div class="d-flex justify-content-center align-items-center h-100">
+			<div class="spinner-border text-secondary" role="status">
+				<span class="visually-hidden">Loading...</span>
+			</div>
+		</div>
+	</div>
+</template>
--- a/server/ui/api/v1/swagger.json
+++ b/server/ui/api/v1/swagger.json
@ -27,7 +27,7 @@
      "get": {
        "description": "Returns basic runtime information, message totals and latest release version.",
        "produces": [
-          "application/octet-stream"
+          "application/json"
        ],
        "schemes": [
          "http",
@ -36,7 +36,7 @@
        "tags": [
          "application"
        ],
-        "summary": "Get the application information",
+        "summary": "Get application information",
        "operationId": "AppInformation",
        "responses": {
          "200": {
@ -240,6 +240,54 @@
        }
      }
    },
+    "/api/v1/message/{ID}/release": {
+      "post": {
+        "description": "Release a message via a preconfigured external SMTP server..",
+        "consumes": [
+          "application/json"
+        ],
+        "produces": [
+          "text/plain"
+        ],
+        "schemes": [
+          "http",
+          "https"
+        ],
+        "tags": [
+          "message"
+        ],
+        "summary": "Release message",
+        "operationId": "Release",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "message id",
+            "name": "ID",
+            "in": "path",
+            "required": true
+          },
+          {
+            "description": "Array of email addresses to release message to",
+            "name": "To",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "description": "Array of email addresses to release message to",
+              "type": "object",
+              "$ref": "#/definitions/ReleaseMessageRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/OKResponse"
+          },
+          "default": {
+            "$ref": "#/responses/ErrorResponse"
+          }
+        }
+      }
+    },
    "/api/v1/messages": {
      "get": {
        "description": "Returns messages from the mailbox ordered from newest to oldest.",
@ -438,6 +486,31 @@
          }
        }
      }
+    },
+    "/api/v1/webui": {
+      "get": {
+        "description": "Returns configuration settings for the web UI.",
+        "produces": [
+          "application/json"
+        ],
+        "schemes": [
+          "http",
+          "https"
+        ],
+        "tags": [
+          "application"
+        ],
+        "summary": "Get web UI configuration",
+        "operationId": "WebUIConfiguration",
+        "responses": {
+          "200": {
+            "$ref": "#/responses/WebUIConfigurationResponse"
+          },
+          "default": {
+            "$ref": "#/responses/ErrorResponse"
+          }
+        }
+      }
    }
  },
  "definitions": {
@ -456,7 +529,7 @@
      "x-go-package": "net/mail"
    },
    "AppInformation": {
-      "description": "Response includes the current and latest Mailpit versions, database info, and memory usage",
+      "description": "Response includes the current and latest Mailpit version, database info, and memory usage",
      "type": "object",
      "properties": {
        "Database": {
@ -593,6 +666,10 @@
            "$ref": "#/definitions/Address"
          }
        },
+        "ReturnPath": {
+          "description": "ReturnPath is the Return-Path",
+          "type": "string"
+        },
        "Size": {
          "description": "Message size in bytes",
          "type": "integer",
@ -747,6 +824,22 @@
      },
      "x-go-package": "github.com/axllent/mailpit/server/apiv1"
    },
+    "ReleaseMessageRequest": {
+      "description": "Release request",
+      "type": "object",
+      "properties": {
+        "to": {
+          "description": "To\nin:body",
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "x-go-name": "To"
+        }
+      },
+      "x-go-name": "releaseMessageRequest",
+      "x-go-package": "github.com/axllent/mailpit/server/apiv1"
+    },
    "SetReadStatusRequest": {
      "description": "Set read status request",
      "type": "object",
@ -773,7 +866,7 @@
      "type": "object",
      "properties": {
        "ids": {
-          "description": "ids\nin:body",
+          "description": "IDs\nin:body",
          "type": "array",
          "items": {
            "type": "string"
@ -791,6 +884,32 @@
      },
      "x-go-name": "setTagsRequest",
      "x-go-package": "github.com/axllent/mailpit/server/apiv1"
+    },
+    "WebUIConfiguration": {
+      "description": "Response includes global web UI settings",
+      "type": "object",
+      "properties": {
+        "MessageRelay": {
+          "description": "Message Relay information",
+          "type": "object",
+          "properties": {
+            "Enabled": {
+              "description": "Whether message relaying (release) is enabled",
+              "type": "boolean"
+            },
+            "ReturnPath": {
+              "description": "Enforced Return-Path (if set) for relay bounces",
+              "type": "string"
+            },
+            "SMTPServer": {
+              "description": "The configured SMTP server address",
+              "type": "string"
+            }
+          }
+        }
+      },
+      "x-go-name": "webUIConfiguration",
+      "x-go-package": "github.com/axllent/mailpit/server/apiv1"
    }
  },
  "responses": {
@ -822,6 +941,17 @@
    },
    "TextResponse": {
      "description": "Plain text response"
+    },
+    "WebUIConfigurationResponse": {
+      "description": "Web UI configuration",
+      "schema": {
+        "$ref": "#/definitions/WebUIConfiguration"
+      },
+      "headers": {
+        "Body": {
+          "description": "Web UI configuration settings"
+        }
+      }
    }
  }
 }
--- a/storage/database.go
+++ b/storage/database.go
@ -404,6 +404,11 @@ func GetMessage(id string) (*Message, error) {
 		from = &mail.Address{Name: env.GetHeader("From")}
 	}

+	returnPath := strings.Trim(env.GetHeader("Return-Path"), "<>")
+	if returnPath == "" {
+		returnPath = from.Address
+	}
+
 	date, err := env.Date()
 	if err != nil {
 		// return received datetime when message does not contain a date header
@ -435,18 +440,19 @@ func GetMessage(id string) (*Message, error) {
 	}

 	obj := Message{
-		ID:      id,
-		Read:    true,
-		From:    from,
-		Date:    date,
-		To:      addressToSlice(env, "To"),
-		Cc:      addressToSlice(env, "Cc"),
-		Bcc:     addressToSlice(env, "Bcc"),
-		ReplyTo: addressToSlice(env, "Reply-To"),
-		Subject: env.GetHeader("Subject"),
-		Tags:    getMessageTags(id),
-		Size:    len(raw),
-		Text:    env.Text,
+		ID:         id,
+		Read:       true,
+		From:       from,
+		Date:       date,
+		To:         addressToSlice(env, "To"),
+		Cc:         addressToSlice(env, "Cc"),
+		Bcc:        addressToSlice(env, "Bcc"),
+		ReplyTo:    addressToSlice(env, "Reply-To"),
+		ReturnPath: returnPath,
+		Subject:    env.GetHeader("Subject"),
+		Tags:       getMessageTags(id),
+		Size:       len(raw),
+		Text:       env.Text,
 	}

 	// strip base tags
--- a/storage/database_test.go
+++ b/storage/database_test.go
@ -9,6 +9,7 @@ import (
 	"time"

 	"github.com/axllent/mailpit/config"
+	"github.com/axllent/mailpit/utils/logger"
 	"github.com/jhillyerd/enmime"
 )

@ -230,7 +231,7 @@ func BenchmarkImportMime(b *testing.B) {
 }

 func setup() {
-	config.NoLogging = true
+	logger.NoLogging = true
 	config.MaxMessages = 0
 	config.DataFile = ""

--- a/storage/structs.go
+++ b/storage/structs.go
@ -25,6 +25,8 @@ type Message struct {
 	Bcc []*mail.Address
 	// ReplyTo addresses
 	ReplyTo []*mail.Address
+	// ReturnPath is the Return-Path
+	ReturnPath string
 	// Message subject
 	Subject string
 	// Message date if set, else date received
--- a/utils/logger/logger.go
+++ b/utils/logger/logger.go
@ -7,12 +7,17 @@ import (
 	"os"
 	"regexp"

-	"github.com/axllent/mailpit/config"
 	"github.com/sirupsen/logrus"
 )

 var (
 	log *logrus.Logger
+	// VerboseLogging for verbose logging
+	VerboseLogging bool
+	// QuietLogging shows only errors
+	QuietLogging bool
+	// NoLogging shows only fatal errors
+	NoLogging bool
 )

 // Log returns the logger instance
@ -20,13 +25,13 @@ func Log() *logrus.Logger {
 	if log == nil {
 		log = logrus.New()
 		log.SetLevel(logrus.InfoLevel)
-		if config.VerboseLogging {
+		if VerboseLogging {
 			// verbose logging (debug)
 			log.SetLevel(logrus.DebugLevel)
-		} else if config.QuietLogging {
+		} else if QuietLogging {
 			// show errors only
 			log.SetLevel(logrus.ErrorLevel)
-		} else if config.NoLogging {
+		} else if NoLogging {
 			// disable all logging (tests)
 			log.SetLevel(logrus.PanicLevel)
 		}
--- a/utils/tools/message.go
+++ b/utils/tools/message.go
@ -0,0 +1,59 @@
+// Package tools provides various methods for variouws things
+package tools
+
+import (
+	"bufio"
+	"bytes"
+	"net/mail"
+	"regexp"
+
+	"github.com/axllent/mailpit/utils/logger"
+)
+
+// RemoveMessageHeaders scans a message for headers, if found them removes them.
+// It will only remove a single instance of any header, and is intended to remove
+// Bcc & Message-Id.
+func RemoveMessageHeaders(msg []byte, headers []string) ([]byte, error) {
+	reader := bytes.NewReader(msg)
+	m, err := mail.ReadMessage(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	reBlank := regexp.MustCompile(`^\s+`)
+
+	for _, hdr := range headers {
+		// case-insentitive
+		reHdr := regexp.MustCompile(`(?i)^` + regexp.QuoteMeta(hdr+":"))
+
+		// header := []byte(hdr + ":")
+		if m.Header.Get(hdr) != "" {
+			scanner := bufio.NewScanner(bytes.NewReader(msg))
+			found := false
+			hdr := []byte("")
+			for scanner.Scan() {
+				line := scanner.Bytes()
+				if !found && reHdr.Match(line) {
+					// add the first line starting with <header>:
+					hdr = append(hdr, line...)
+					hdr = append(hdr, []byte("\r\n")...)
+					found = true
+				} else if found && reBlank.Match(line) {
+					// add any following lines starting with a whitespace (tab or space)
+					hdr = append(hdr, line...)
+					hdr = append(hdr, []byte("\r\n")...)
+				} else if found {
+					// stop scanning, we have the full <header>
+					break
+				}
+			}
+
+			if len(hdr) > 0 {
+				logger.Log().Debugf("[release] removing %s header", hdr)
+				msg = bytes.Replace(msg, hdr, []byte(""), 1)
+			}
+		}
+	}
+
+	return msg, nil
+}