I followed 'www.postfix.org/VIRTUAL_README.html : As simple as can be:
shared domains, UNIX system accounts' to set style like 'mydestination =
$myhostname localhost.$mydomain ... example.com' for a few domains (except
example has no commas like main.cf). Regardless of $myhostname, $mydomain
(also tested default/unset) it defers mail, saying $mydomain loops back to
myself.
'mydestination' should be used for the server's hostname/ptr domain.
Additional domains you want to accept email for should be configured as
virtual domains.
I believe what the issue is, and i hope im wording this right. Let's say the
server's hostname is example1.com and you have additionally added
example2.com to 'mydestination'.
Email comes in for u...@example2.com, domain matches mydestination, postfix
accepts delivery. Postfix goes to stuff it in the inbox for
u...@example2.com. Can't find that user. Can only find u...@example1.com,
because this machine is for users of example1.com, because that is this
servers hostname. Okay, so postfix will try to deliver the email to the
server that has u...@example2.com, MX lookup, oh look, that's me. Loop back.
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