I’ve had RT working for quite a while on Ubuntu 14.04 with Postfix 2.11.0.
I’ve since spun up a new Ubuntu instance (16.04) which comes with Postfix 3.1. RT installed just fine and most things seem to be working. Incoming email works fine on my older install (i.e., postfix picks it up and sends it to the proper queue) – but this does not work on my new install with Postfix 3.1.
As a note – I simply am not a Postfix master, I barely know how to spell it! At this point everything looks the same between my two installations from a configuration perspective. I’m left to thinking that Postfix 3.x is my problem. Looking at /var/log/mail.log I see:
Aug 7 14:06:36 rt-hr postfix: Postfix is running with backwards-compatible default settings
Aug 7 14:06:36 rt-hr postfix: See http://www.postfix.org/COMPATIBILITY_README.html for details
Aug 7 14:06:36 rt-hr postfix: To disable backwards compatibility use “postconf compatibility_level=2” and “postfix reload”
So I did those two postfix commands on a whim and it still does not work.
When sending test emails to my RT queues I do not get a bounce back for many many hours; but eventually I get:
The response was:
The recipient server did not accept our requests to connect.
The system is resolvable from the Internet – I do not have an MX record setup though – I have an A record.
With that little information, does anybody have any suggestions?