So I ask myself, "what would cause Postfix to treat mail as local mail," and the answer suddenly becomes very clear.
Originally Posted by sjsobol
I feel stupid. I really should have figured this out before. My only excuse is that I'd never touched Postfix before I installed Zimbra (and I only started mucking around with the Postfix configs a couple weeks ago).
Zimbra was set up this way:
Duh! No wonder Zimbra's trying to process mail for lists.MyDomain.com.
Here's what I did:
In Zimbra's main.cf:
(This works because all of the Zimbra-hosted domains are virtual domains.)
inet_interfaces = 18.104.22.168, 127.0.0.1
mydestination = localhost
In the standalone Postfix's main.cf:
And the Split Domain setup is NOT necessary.
inet_interfaces = 22.214.171.124
mydestination = lists.MyDomain.com myPostfixServer.myDomain.com
Thank you for your time, Phoenix; you did actually help me get to the correct answer.