Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

Posted by MadBoy on Server Fault See other posts from Server Fault or by MadBoy
Published on 2012-07-04T13:12:48Z Indexed on 2012/07/04 15:17 UTC
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Filed under:

smtp

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exchange-2010

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reverse-dns

I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose?

I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly.

I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com

This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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