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Need help configuring postfix correctly

Doug Poulin
Doug Poulin asked
Last Modified: 2020-03-03
Having problems getting postfix set up correctly.
In my case the server has several virtual domains. I have a system API that sends out emails and I want any bouncebacks to come to it.  It's not the primary domain for the server.

Assuming abc.com is the primary domain and def.com is the one I need work, I have the following entries in various configuration files:


def.com OK

mail_notifier@def.com mail_notifier@localhost
(I've also tried)
mail_notifier@def.com mail_notifier

I can't use the primary domain because we use office 365 and the mail MX record points to microsoft not our server.  This is also our web server, so I can't mess with the primary domain address.

The error I get back is
Recipient address rejected. User unknown in virtual alias table.

All I want to do is collect the bouncebacks from the mail_notifier account so I can automate handling for the end users.  Any help is appreciated.
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