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 From:  "Richard Parvass" <Richard dot Parvass at aaland dot co dot uk>
 To:  "sylikc" <sylikc at gmail dot com>, =?iso-8859-1?Q?Carlos_Ros=E1rio?= <carlos dot rosario at netcabo dot pt>
 Cc:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] Two Mail Servers with 2 Public IP's
 Date:  Thu, 24 Mar 2005 10:30:55 -0000
FYI, CNAMEs are prohibited in MX records, according to RFC1912 2.4, and RFC2181 10.3.

-----Original Message-----
From: sylikc [mailto:sylikc at gmail dot com] 


So, assuming you are serving your own DNS, add a priority 5 entry in
your MX record for @domain_A.com to CNAME mail.server_A.com and do the
same for @domain_B.com -> mail.server_B.com


So, as a recap, add MX records with CNAMEs that will resolve to
external IP from outside and internal IP from inside.  Your servers
are the ones that will actually be "sending" the mail, so those are
the ones that need the correct DNS resolution.

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