Email & PTR Issues
jep at obrien-pifer.com
Tue Nov 7 15:31:29 UTC 2017
Hello. I'm looking for help with an issue I've been fighting for some time.
Running BIND 9.9.
Forwarding UDP & TCP Port 53 through firewall.
I have issues emailing to certain domains. I use my own mail server to
deliver mail. It is currently not sending through SMTP Relay. The
failure says that I have a missing PTR record. For example:
said: 550 5.7.1 Connections not accepted from servers without a valid
sender domain.alph151 Fix reverse DNS for 18.104.22.168 (in reply to
If I do a test on mxtoolbox it also says I have the issue:
If I look at dnsstuff and do a test on Mail Server Test Center and run
selected tests under the MX Dashboard it gives a DNS Mismatch.
BUT, If I look at dnsstuff,com and do a reverse lookup test, that seems
Also, from a pc somewhere else on the internet, if you change your DNS
server to mine (or use nslookup) it resolves the reverse entry ok.
> server 22.214.171.124
Default Server: [126.96.36.199]
If anyone has any helpful suggestions it is appreciated.
I also tried moving my DNS to the provider I purchased my domain name
from thinking that would be an easy fix. They don't support PTR records
and actually had no clue what they even were.
I've also tried configuring my mail servers to use ATT's SMTP Relay, but
so far I've been unsuccessful getting it to send at all. The emails keep
getting deferred. Obviously not an issue for anyone on this list. Just
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