I'm having a similar issue, can send but not receive. I have also reviewed the WIKI, but as of yet I cannot determine why I cannot receive. I have an outside server in which I can connet to Postfix fine, thus my firewall rules appear to be in place. I see no errors in my logs indicating that postfix is having an issue (no connection refused). Additionally I have verified that I can telnet to the zimbraMailHost on port 7025 and receive a connection from the LMTP server.
I guess the big concern is that I don't see anything in the logs indicating an attempt even. I do have an MX record set up, which is how I am testing Postfix externally (on port 25). I used DNSStuff's email test (
http://www.dnsstuff.com) and it confirmed that it could route the email correctly and receive a connection to my mail server. So after doing all that, I must admit I am somewhat at a loss as to what the issue is. I will admit I am in no way a mail expert, so any assistance you can provide for troubleshooting would be greatly appreciated.
Thanks in advance.