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Originally Posted by bobby have you looked in /var/log/zimbra.log to see what postfix says when it bounces their deliveries? to what domain(s) are the inbound messages destined? are those domains provisioned in zimbra (zmprov gad)?
hmm "the connection is refused" is different from "not accepting relayed messages" though you already mentioned "I can telnet to the mail server on port 25 and hand deliver a message just fine". as long as that means from outside the network 
definitely should see what postfix is saying in /var/log/zimbra.log
reading up on postfix is a great idea (i do it myself sometimes  ). you'll notice a number of postfix parameters are configurable through the zimbra admin console, including relayhost, though it is used for outgoing mail so is outside our scope for this problem |
I will check those logs, any other places you know that might have any needed information in it?
Yes, I can telnet from outside our network. I have setup zimbra to serve mail for our domain name. We have all the appropriate records and such for email setup on the public DNS server, etc. I am sure that email in general works, as we have a Exchange server that has been running for several years, and it works great*.
Most of the information I am finding here, and elsewhere on the net, addresses the reverse of this problem. They can receive but can't send mail.
Just an idea, the outside mail servers are simply doing spam filters and virus filtering, i noticed Zimbra supports spam filtering. As a possible solution to this problem, would just disableing this server from our ISP and doing the virus/spam interneal allow things to flow more smoothly?