Topic: fallback/relay gives postfix reject
I am trying iRedMail to replace our mailservers in the future, but I met some issues I can't figure out yet. I will post them separately to keep things organized.
For some domains I want to act this server as a fallback for another mailserver, so the domains doesn't actually exist on this server. So I set the domain in PostfixAdmin to "relay" or "virtual" and the fallback MX-box checked, but Postfix won't accept mail this domains and drops the message:
Relay access denied
But it is impossible to set all the email adresses for this domain, so it should accept all the mail for this domain and forward it to another mailserver who can handle the mail.
EDIT/UPDATE: Found the solution. You need also a special alias for this. It is shown in the alias-menu of PostfixAdmin.