We are using zimbra 4.01. We need to configure the smtp interface to accept incoming mail sent to valid email users on our zimbra domains (eg foo.com & bar.com).
The reason is that we have a large antispam server in the DMZ doing all the hard (cpu) work, and needs to check valid email users with zimbra (using a smtp callout method), otherwise our support team gets 100s of "undeliverable" mails a day eg to email@example.com etc...
I think that postifx can do this but maybe there's an easier zmprov solution
Any help would be appreciated !