This option (default off) silently ignores any new messages with duplicate Message-IDs. This update includes a new database structure and automatic rebuild of existing data.
This enables a SMTP server to be configured, and messages to be manually "released" via the relay server. Aditionally, messages can be auto-relayed via the SMTP server do Mailpit acts as a form of caching proxy.
@see #29
In order to capture Bcc recipients from some platfoms (eg: Laravel) when the SMTP recipients contain Bcc recipients but are not listed in the message headers, the missing addresses are now added into the message Bcc header. If the Bcc header does not exist then it is created.
Resolves#35
