MX Error

[Robert L. Cochran Jr.]

I don't know the entire answer, but the MX record looks wrong. The format is

yourdomain.com.	IN	MX	10	yourmailserver.yourdomain.com.

notice the trailing dots at the end of each hostname. They mean the hostname
is completely qualified. Therefore 'gw' won't get turned into
'gw.[origin-name is appended here].' The hostname on the right side of the
MX record has to be the name of the mail server.

You should see Section 15.3 of the book Sendmail, 2nd edition, by Costales
and Allman. That explains MX records. Also check www.sendmail.org ... they
have a page on virtual hosting of email addresses that might give you some
clues.

With the understanding that I'm inexperienced with DNS and others can
correct me...what I think you need is 2 sets of zone records. One is
authoritative for navitaire.com and contains an MX record which points to
the correct server. The second zone should be authoritative for prasol.com
and it should contain an MX record pointing to the same mail server host as
for navitaire.com.

Next, and again I'm speaking with the voice of inexperience, you need to do
some fancy footwork with aliasing the email addresses for prasol.com. and
navitaire.com. once incoming mail actually arrives at the server. You need
something like a virtuserstable and an aliases file to map mail addresses to
the right recipient. Since you are using Exchange server and I'm unfamiliar
with Exchange, I'll stop here.

Bob



-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]On
Behalf Of Brad
Sent: Wednesday, December 27, 2000 1:26 PM
To: comp-protocols-dns-bind at moderators.isc.org
Subject: MX Error


I'm not sure how to explain this problem, but here goes....Our company
decided to switch domain names from prasol.com to navitaire.com, but for
a period of about 3 months we are going to use both.  I created the
navitaire.com zone in our DNS db's and everything appears to be working
except mail.  When I send an email from the outside world to myself, I
get a bounced mail that looks like this:

#########################################################
The original message was received at Wed, 27 Dec 2000 11:10:48 -0600
from uucp at localhost

   ----- The following addresses had delivery problems -----
<brad at navitaire.com>  (unrecoverable error)

   ----- Transcript of session follows -----
554 MX list for navitaire.com points back to gw.prasol.com
550 <brad at navitaire.com>... Host unknown (Name server: navitaire.com: no
data known)

   ----- Original message follows -----
#########################################################

I can send an email from inside to out though.

Also my MX records in both my DNS db's look like this:

        IN MX        10 gw
gw   IN A            63.224.27.10

Any help here is going to be greatly appreciated, if anyone has a clue
on what the problem may be and needs more info, let me know.
Thanks.

Brad M.