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How does a Reverse DNS lookup work with regards to spam filters?

I have a question about setting a reverse DNS record for my mail server.

Which is the best way to configure:

1.) The IP address reverses to the domain that is sending the email (ie. @mydomain.com)

2.) The MX record target for all domains on the mail server (ie mail.mailserver.com)

Any help is appreciated.

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marked as duplicate by mailq, Ward, Scott Pack, HopelessN00b, voretaq7 Aug 31 '12 at 18:24

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2 Answers 2

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The PTR record should point to the mailserver hostname(that you should also have a A record for). Due to when email is sent in the headers you will see the server hostname and that is what the spamcheckers see.

A SPF record is used to verify the email for the domain name is coming from the right server.

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To put a little finer point on it: your A and PTR records should match the FQDN that the server identifies itself with in the SMTP HELO command. –  joeqwerty Nov 30 '11 at 22:30
It's worth noting that SPF records are less valuable than DK/DKIM. ISP's give a lot more weight to valid DK/DKIM signatures than SPF - at least in terms of a host's overall reputation. That said, you should employ both. –  anastrophe Dec 1 '11 at 7:11

You have an A record for the MTA, and an MX record to match. Add a PTR as well. Repeat for every MTA you want to use.

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