Designating the Postmaster

According to RFC 5321: Any system that includes an SMTP server supporting mail relaying or delivery MUST support the reserved mailbox "postmaster" as a case-insensitive local name.

Edit local-recipients.js and change the value of the PostmasterAliasMapper.canonical attribute. For example if the local user,, should receive mails sent to the postmaster addresses then the result should look like this:

... setup(PostmasterAliasMapper, { canonical: "" }), ...

The designated Postmaster will receive mails sent to the Postmaster of any local domains (for example and also to the special Postmaster (without domain) address.