Smtp Reverse Dns Mismatch Issue [Closed]
According to Mxtoolbox My Server Has a Problem. Please Review: the Tool Shows a 'Smtp Reverse Dns Mismatch' and I Don't Have an Idea Why. My Ptr Records Look...
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According to MXToolbox my server has a problem.
Please review:
The tool shows a 'SMTP Reverse DNS Mismatch' and I don't have an idea why. My PTR Records look like:
158.22.202.116.in-addr.arpa. 86400 IN PTR 158.22.202.116.pleiades.webmaus.net.
I've also got A/AAAA records added for pleiades. Any hints on where the problem could be?
1 Answer
Reverse DNS: closed PTR-A loop
SMTP servers check "closed loop" of PTR and A records.
IP address -> [ PTR record ] -> Name -> [ A record ] -> IP address
Rogue nets can set PTR to any name they like.
There seems to be no A record for 158.22.202.116.pleiades.webmaus.net.
Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.
