I feel like this is going to be something stupid but I cant find it and I’m sure its in the PBX. I ran the conversion tool on an old PBX and after that point I started seeing messages like this in the maillog
Nov 20 14:52:15 atlas postfix/smtp: B24ED2169B35: to=<firstname.lastname@example.org >, relay=mailstore1.secureserver.net[18.104.22.168]:25, delay=0.61, delays=0.15/ 0.02/0.45/0, dsn=4.0.0, status=deferred (host mailstore1.secureserver.net[72.167 .238.32] refused to talk to me: 421 p3plibsmtp01-15.prod.phx3.secureserver.net C MGW Temporarily rejected. Reverse DNS for failed. IB108 <http:// x.co/srbounce>)
IP of PBX and my email address are removed in this post but are correct in the log entry. Confirmed that they’re in fact using Go Daddy (22.214.171.124). I also confirmed that I have the reverse DNS PTR record created. Using the same DNS server as before in ifcfg-eth0 (126.96.36.199).This one appears to be set up identically to another server that is working, at least everywhere that I’ve looked so far.
Any suggestions are welcomed.