In order to migrate to a new mailserver with little dns problems/downtime, I have set up a second postfix that is currently accessible on a subdomain mx record, eg. the main postfix accepts mail for user@example.
com while the second postfix also accepts mail for
[email protected].
com.
I added a forwarding rule to postfix saying that postfix should forward mail destined for user@example.
com to user@example.
com (for regular local delivery) and to
[email protected].
com.
Local delivery still works as expected, but when trying forward the mail to the new mx, postfix appeds the domain part at the end of the forwarding address, resulting in
[email protected].
com.example.
com, which of course fails and the mail bounces.
Why does postfix mess with the alias name in that way and how can I turn that of?