On Thu, 12 May 2011 14:22:21 +0100 Faris Raouf wrote:

> really good reason why the actual domain in the From line in the envelope
> would not have an MX record.

MX is optional for the domain.  If no IN MX is delegated mails are
delivered to whatever is set in IN A for that domain (that also means 
that you may not delegate IN A if you got IN MX and no plans to use
anything that mails for that domain).

 > Basically an email from [email protected]   to
 > [email protected]  was DENIED_SENDER_NO_MX (sending IP's rDNS was
 > mail.sending-domain.com)
 > sending-domain.com DOES have an MX record but mail.sending-domain.com 
 > does not.

To me this may be a bug as from what you said, mail.sending-domain.com 
is just a messenger and it does need to even accept incoming mails,
therefore lack of MX of mail.sending-domain.com is perfectly fine.
Also, for the same reson, it would be wrong assumption that
mail.sending-domain.com shall match one of MXes for sending-domain.com.

Regards,
-- 
"Daddy, what "Formatting drive C:" means?"...

Marcin             http://wfmh.org.pl/carlos/
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