PTR Records

m_jundi used Ask the Experts™

We have Mail Server with four Domains. One PTR Record is created with our ISPs per WAN IP.

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

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).

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David FavorFractional CTO
Distinguished Expert 2018

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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