I have 2 boxes sitting on 2 different servers with of course different ip addresses. Both servers happily exchange emails with all addresses, except, they will not communicate with each other.
I’m running v73 on both servers with zero errors or warnings
Help would be much appreciated
Do they, by any chance, have the same domain?
If yes, there’s the problem. If you want multiple mail servers on the same domain (eg a main and a backup), you’ll need a setup quite different to MIAB.
Thanks for your response.
Each server has separate domain names
Do you mean mails don’t arrive? Do you get a rejection message?
It might be graylisting, meaning the first mail might take a while to arrive.
To pinpoint the issue, look at /var/log/mail.log at the time you send the mails. Do this for both servers.
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Resolved
Thanks to all who responded.
It was a firewall issue.