I’ve one of those situations where mailboxes are @localdomain and users should be able to send messages outside via external relay as, let’s say, email@example.com.
So the goal here is:
sender user@localdomain -> *anyuser*@localdomain ----> no rewrite
sender user@localdomain -> rest of the world ----> sender rewrite as firstname.lastname@example.org -> external relay
Postfix has a parameter for this: smtp_generic_maps (zimbraMtaSmtpGenericMaps), this works but problem is that senders are rewritten when recipients are internal too – and that's quite strange (as Postfix guide says "It does not happen when you send mail between addresses on the local machine").
P.S. I'm already using Personas as external accounts, the issue here is when using internal accounts only.
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