Multiple A records and reverse DNS

[Tony Finch]

Thomas Schulz <schulz at adi.com> wrote:

> We are switching service providers and I understand that many email SPAM
> prevention systems insist on the reverse DNS matching the forward DNS.
> If I have two A records for our mail server and the reverse record matches
> one of them, will that be good enough. Or will the fact that the other A
> record does not match cause trouble.

I would suggest setting up a separate name with matching forward and
reverse DNS for each IP address. The existing name can be an alias
pointing at both addresses. For example have a look at the setup for
ppsw.cam.ac.uk which is our central mail relay. (The name is a relic from
the days of the JANET coloured book protocols and a grivously hacked fork
of MMDF.)

Tony.
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