[cobalt-users] MX with External Mail Server

["Jay Fesco" <jay@xxxxxxxxxxxx>]

Hi,

Thought I'd share a solution I found to a problem that appears quite often
in the list here.  My need was to host a domain on my server, but forward
all email to the Client's internal Exchange server.  Of course, we have A
records set up for www.domain.com on our Raq3, and the client wants to
receive mail on his Exchange server as somebody@xxxxxxxxxxx

As instructed by the archives, I:

Set up an A record to point to the client's Exchange server's IP (named
mail.domain.com).
Set up a PTR record for the same.
Set up an MX record to point to mail.domain.com for www.domain.com.

Should work, right?  Not for me.  I sent a test mail, and it was rejected by
MY mail server for User Not Found.  Wait a minute, didn't I tell that &%^$
MX record to use mail.domain.com?  Why did it use my mail server and not
theirs?

Answer:  Apparently, you have to tell the Cobalt GUI NOT to accept email for
domains that use an external mail server even if you have the MX record set
up to point 'outside'.  Sheesh.

Hope this helps someone.

Jay Fesco