Reverse DNS / email config issue

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[19704]: B24ED2169B35: to=<[email protected] >,[]:25, delay=0.61, delays=0.15/ 0.02/0.45/0, dsn=4.0.0, status=deferred (host[72.167 .238.32] refused to talk to me: 421 C MGW Temporarily rejected. Reverse DNS for failed. IB108 <http://>)

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 ( I also confirmed that I have the reverse DNS PTR record created. Using the same DNS server as before in ifcfg-eth0 ( 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.

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