diff --git a/cmd/root.go b/cmd/root.go
index e934408..ccdc950 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -82,6 +82,7 @@ func init() {
 	initConfigFromEnv()
 
 	rootCmd.Flags().StringVarP(&config.Database, "database", "d", config.Database, "Database to store persistent data")
+	rootCmd.Flags().StringVar(&config.Label, "label", config.Label, "Optional label identify this Mailpit instance")
 	rootCmd.Flags().StringVar(&config.TenantID, "tenant-id", config.TenantID, "Database tenant ID to isolate data")
 	rootCmd.Flags().IntVarP(&config.MaxMessages, "max", "m", config.MaxMessages, "Max number of messages to store")
 	rootCmd.Flags().BoolVar(&config.UseMessageDates, "use-message-dates", config.UseMessageDates, "Use message dates as the received dates")
@@ -172,6 +173,8 @@ func initConfigFromEnv() {
 
 	config.TenantID = os.Getenv("MP_TENANT_ID")
 
+	config.Label = os.Getenv("MP_LABEL")
+
 	if len(os.Getenv("MP_MAX_MESSAGES")) > 0 {
 		config.MaxMessages, _ = strconv.Atoi(os.Getenv("MP_MAX_MESSAGES"))
 	}
diff --git a/config/config.go b/config/config.go
index b0d888c..ceb80bf 100644
--- a/config/config.go
+++ b/config/config.go
@@ -15,6 +15,7 @@ import (
 	"github.com/axllent/mailpit/internal/auth"
 	"github.com/axllent/mailpit/internal/logger"
 	"github.com/axllent/mailpit/internal/spamassassin"
+	"github.com/axllent/mailpit/internal/tools"
 	"gopkg.in/yaml.v3"
 )
 
@@ -32,6 +33,10 @@ var (
 	// allowing multiple isolated instances of Mailpit to share a database.
 	TenantID = ""
 
+	// Label to identify this Mailpit instance (optional).
+	// This gets applied to web UI, SMTP and optional POP3 server.
+	Label = ""
+
 	// MaxMessages is the maximum number of messages a mailbox can have (auto-pruned every minute)
 	MaxMessages = 500
 
@@ -201,7 +206,9 @@ func VerifyConfig() error {
 		Database = filepath.Join(Database, "mailpit.db")
 	}
 
-	TenantID = strings.TrimSpace(TenantID)
+	Label = tools.Normalize(Label)
+
+	TenantID = tools.Normalize(TenantID)
 	if TenantID != "" {
 		logger.Log().Infof("[db] using tenant \"%s\"", TenantID)
 		re := regexp.MustCompile(`[^a-zA-Z0-9\_]`)
diff --git a/internal/tools/utils.go b/internal/tools/utils.go
index 2064f6f..d512475 100644
--- a/internal/tools/utils.go
+++ b/internal/tools/utils.go
@@ -2,6 +2,7 @@ package tools
 
 import (
 	"fmt"
+	"regexp"
 	"strings"
 )
 
@@ -24,3 +25,14 @@ func InArray(k string, arr []string) bool {
 
 	return false
 }
+
+// Normalize will remove any extra spaces, remove newlines, and trim leading and trailing spaces
+func Normalize(s string) string {
+	nlRe := regexp.MustCompile(`\r?\r`)
+	re := regexp.MustCompile(`\s+`)
+
+	s = nlRe.ReplaceAllString(s, " ")
+	s = re.ReplaceAllString(s, " ")
+
+	return strings.TrimSpace(s)
+}
diff --git a/server/apiv1/webui.go b/server/apiv1/webui.go
index d3c9a2d..10f86cd 100644
--- a/server/apiv1/webui.go
+++ b/server/apiv1/webui.go
@@ -12,6 +12,8 @@ import (
 //
 // swagger:model WebUIConfiguration
 type webUIConfiguration struct {
+	// Optional label to identify this Mailpit instance
+	Label string
 	// Message Relay information
 	MessageRelay struct {
 		// Whether message relaying (release) is enabled
@@ -53,6 +55,7 @@ func WebUIConfig(w http.ResponseWriter, _ *http.Request) {
 	//		default: ErrorResponse
 	conf := webUIConfiguration{}
 
+	conf.Label = config.Label
 	conf.MessageRelay.Enabled = config.ReleaseEnabled
 	if config.ReleaseEnabled {
 		conf.MessageRelay.SMTPServer = fmt.Sprintf("%s:%d", config.SMTPRelayConfig.Host, config.SMTPRelayConfig.Port)
diff --git a/server/pop3/server.go b/server/pop3/server.go
index 92a227c..19e8bb4 100644
--- a/server/pop3/server.go
+++ b/server/pop3/server.go
@@ -112,7 +112,11 @@ func handleClient(conn net.Conn) {
 	logger.Log().Debugf("[pop3] connection opened by %s", conn.RemoteAddr().String())
 
 	// First welcome the new connection
-	sendResponse(conn, "+OK Mailpit POP3 server")
+	serverName := "Mailpit"
+	if config.Label != "" {
+		serverName = fmt.Sprintf("Mailpit (%s)", config.Label)
+	}
+	sendResponse(conn, fmt.Sprintf("+OK %s POP3 server", serverName))
 
 	// Set 10 minutes timeout according to RFC1939
 	timeoutDuration := 600 * time.Second
diff --git a/server/smtpd/smtpd.go b/server/smtpd/smtpd.go
index 7e60325..06bf334 100644
--- a/server/smtpd/smtpd.go
+++ b/server/smtpd/smtpd.go
@@ -223,6 +223,10 @@ func listenAndServe(addr string, handler smtpd.MsgIDHandler, authHandler smtpd.A
 		DisableReverseDNS: DisableReverseDNS,
 	}
 
+	if config.Label != "" {
+		srv.Appname = fmt.Sprintf("Mailpit (%s)", config.Label)
+	}
+
 	if config.SMTPAuthAllowInsecure {
 		srv.AuthMechs = map[string]bool{"CRAM-MD5": false, "PLAIN": true, "LOGIN": true}
 	}
diff --git a/server/ui-src/App.vue b/server/ui-src/App.vue
index 200d917..35e336a 100644
--- a/server/ui-src/App.vue
+++ b/server/ui-src/App.vue
@@ -14,11 +14,16 @@ export default {
 	},
 
 	beforeMount() {
-		document.title = document.title + ' - ' + location.hostname
 
 		// load global config
 		this.get(this.resolve('/api/v1/webui'), false, function (response) {
 			mailbox.uiConfig = response.data
+
+			if (mailbox.uiConfig.Label) {
+				document.title = document.title + ' - ' + mailbox.uiConfig.Label
+			} else {
+				document.title = document.title + ' - ' + location.hostname
+			}
 		})
 	},
 
diff --git a/server/ui-src/components/ListMessages.vue b/server/ui-src/components/ListMessages.vue
index 6d74582..2d90299 100644
--- a/server/ui-src/components/ListMessages.vue
+++ b/server/ui-src/components/ListMessages.vue
@@ -133,16 +133,14 @@ export default {
 						{{ getRelativeCreated(message) }}
 					</div>
 					<div class="text-truncate d-lg-none privacy">
-						<span v-if="message.From" :title="'From: ' + message.From.Address">{{
-		message.From.Name ?
-			message.From.Name : message.From.Address
-	}}</span>
+						<span v-if="message.From" :title="'From: ' + message.From.Address">
+							{{ message.From.Name ? message.From.Name : message.From.Address }}
+						</span>
 					</div>
 					<div class="text-truncate d-none d-lg-block privacy">
-						<b v-if="message.From" :title="'From: ' + message.From.Address">{{
-		message.From.Name ?
-			message.From.Name : message.From.Address
-	}}</b>
+						<b v-if="message.From" :title="'From: ' + message.From.Address">
+							{{ message.From.Name ? message.From.Name : message.From.Address }}
+						</b>
 					</div>
 					<div class="d-none d-lg-block text-truncate text-muted small privacy">
 						{{ getPrimaryEmailTo(message) }}
diff --git a/server/ui-src/components/NavMailbox.vue b/server/ui-src/components/NavMailbox.vue
index 4e4d577..5a11e9a 100644
--- a/server/ui-src/components/NavMailbox.vue
+++ b/server/ui-src/components/NavMailbox.vue
@@ -68,7 +68,12 @@ export default {
 
 <template>
 	<template v-if="!modals">
-		<div class="list-group my-2">
+		<div class="text-center badge text-bg-primary py-2 mt-2 w-100 text-truncate fw-normal"
+			v-if="mailbox.uiConfig.Label">
+			{{ mailbox.uiConfig.Label }}
+		</div>
+
+		<div class="list-group my-2" :class="mailbox.uiConfig.Label ? 'mt-1' : ''">
 			<button @click="reloadInbox" class="list-group-item list-group-item-action active">
 				<i class="bi bi-envelope-fill me-1" v-if="mailbox.connected"></i>
 				<i class="bi bi-arrow-clockwise me-1" v-else></i>
diff --git a/server/ui-src/components/NavSearch.vue b/server/ui-src/components/NavSearch.vue
index 82b991d..6f8da99 100644
--- a/server/ui-src/components/NavSearch.vue
+++ b/server/ui-src/components/NavSearch.vue
@@ -54,7 +54,12 @@ export default {
 
 <template>
 	<template v-if="!modals">
-		<div class="list-group my-2">
+		<div class="text-center badge text-bg-primary py-2 mt-2 w-100 text-truncate fw-normal"
+			v-if="mailbox.uiConfig.Label">
+			{{ mailbox.uiConfig.Label }}
+		</div>
+
+		<div class="list-group my-2" :class="mailbox.uiConfig.Label ? 'mt-1' : ''">
 			<RouterLink to="/" class="list-group-item list-group-item-action" @click="pagination.start = 0">
 				<i class="bi bi-arrow-return-left me-1"></i>
 				<span class="ms-1">Inbox</span>
@@ -77,7 +82,8 @@ export default {
 
 	<template v-else>
 		<!-- Modals -->
-		<div class="modal fade" id="DeleteAllModal" tabindex="-1" aria-labelledby="DeleteAllModalLabel" aria-hidden="true">
+		<div class="modal fade" id="DeleteAllModal" tabindex="-1" aria-labelledby="DeleteAllModalLabel"
+			aria-hidden="true">
 			<div class="modal-dialog">
 				<div class="modal-content">
 					<div class="modal-header">
diff --git a/server/ui-src/views/MessageView.vue b/server/ui-src/views/MessageView.vue
index 19fc53c..e7f9387 100644
--- a/server/ui-src/views/MessageView.vue
+++ b/server/ui-src/views/MessageView.vue
@@ -317,8 +317,12 @@ export default {
 	<div class="row flex-fill" style="min-height:0">
 		<div class="d-none d-md-block col-xl-2 col-md-3 mh-100 position-relative"
 			style="overflow-y: auto; overflow-x: hidden;">
+			<div class="text-center badge text-bg-primary py-2 mt-2 w-100 text-truncate fw-normal"
+				v-if="mailbox.uiConfig.Label">
+				{{ mailbox.uiConfig.Label }}
+			</div>
 
-			<div class="list-group my-2">
+			<div class="list-group my-2" :class="mailbox.uiConfig.Label ? 'mt-1' : ''">
 				<button @click="goBack()" class="list-group-item list-group-item-action">
 					<i class="bi bi-arrow-return-left me-1"></i>
 					<span class="ms-1">Return</span>
diff --git a/server/ui/api/v1/swagger.json b/server/ui/api/v1/swagger.json
index fe32aec..b905f7c 100644
--- a/server/ui/api/v1/swagger.json
+++ b/server/ui/api/v1/swagger.json
@@ -1635,6 +1635,10 @@
           "description": "Whether messages with duplicate IDs are ignored",
           "type": "boolean"
         },
+        "Label": {
+          "description": "Optional label to identify this Mailpit instance",
+          "type": "string"
+        },
         "MessageRelay": {
           "description": "Message Relay information",
           "type": "object",