From: Geert Hendrickx (ghentelenet.be)
Date: Thu Feb 01 2007 - 16:09:43 CST

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On Wed, Jan 31, 2007 at 10:53:52PM -0500, Brock Palen wrote:
> I have a question for postfix admins. I have a postfix server that
> hosts several domains. (all virtual). The server only has a single
> IP and thus when you do a reverse look up you always only get one
> name mail.domain1.com so if i have the MX record for one of the
> domains i host set to mail.otherdomain.com that resolves the same
> address if another mail server to verify sending mail does a reverse
> lookup to make sure the name and ip match it will fail. Is this much
> of a problem? Or should i se the MX record for all domains to
> mail.domain1.com ?

What matters is that the IP address (which is the same for all domains)
has a proper PTR record to a hostname, and that this hostname, whatever
it is (probably mail.domain1.com in your case), resolves to the same IP.

        Geert

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