PTR Records

m_jundi
m_jundi used Ask the Experts™
on
Hello

We have Mail Server with four Domains. One PTR Record is created with our ISPs per WAN IP.
mail.company.com 1.1.1.1
mail2.company.com 2.2.2.2

Do we have to create additional PTR records for other 3 domains ? and Each WAN should point to 4 Domains ?
or one is enough ?

Thank You
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Jeremy WeisingerSenior Network Consultant / Engineer

Commented:
No you just need it for one as long as the advertized host name in the HELO/EHLO is the same. You should be able to send for any domain as long as things are setup properly (SPF, DKIM, etc).

More info: https://en.m.wikipedia.org/wiki/Forward-confirmed_reverse_DNS
David FavorFractional CTO
Distinguished Expert 2018

Commented:
You require PTR records for any IP sending mail... well... if you expect any deliverability, you require a PTR record.

You haven't stated if they above IPs are sending or receiving email.

MX records don't require PTR records, only IPs sending/initiating SMTP connections on port 25.

IPs creating authenticated (port 587) submissions, usually don't require PTR records, as they're considered clean/good because they have the user/pass required to initiate a submission.

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