Re: DNS / ISA and Exchange issue

From: Jim Harrison [MSFT] (jmharr_at_online.microsoft.com)
Date: 10/03/04 

Date: Sun, 3 Oct 2004 08:42:59 -0700

This is neither ISA nor DNS.
The key to this is the error message:
"Unable to relay for mir@smtp.ourdomain.com"
The mail server is not configured to accept mail for smtp.ourdomain.com. 

-- 
 Jim Harrison [ISASE]
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<anonymous@discussions.microsoft.com> wrote in message news:164f01c4a629$b3e02e20$a601280a@phx.gbl...
Howdy,
Having recently taken over a network I am trying to iron
out some bugs.
I am getting an error from outside mail servers when trying
to send out a daily newsletter to them via a massmailer
tool on a users desktop;
==================================
Your message did not reach some or all of the intended
recipients.
The following recipient(s) could not be reached:
someone@adomain.com
The e-mail system was unable to deliver the message, but
did not report a specific reason.  Check the address and
try again.  If it still fails, contact your system
administrator.
<mail.ourdomain.com #4.0.0 smtp;450
<mir@smtp.ourdomain.com>: Sender address rejected:
undeliverable address: host smtp.ourdomain.com
[XXX.XXX.XXX.171 (our IP address)] said: 550 5.7.1 Unable
to relay for mir@smtp.ourdomain.com (in reply to RCPT TO
command)>
==============================================
All signs point to a DNS issue, but I am just a bit stumped
Some background info;
- Our network is running 4 external IP addresses. We have
smtp.ourdomain.com mapped to xxx.xxx.xxx.171, we also have
mail.ourdomain.com mapped to xxx.xxx.xxx.170
- Our MX record is smtp.ourdomain.com (IP address
xxx.xxx.xxx.171).
- We have granted relay access for this particular client
in exchange (95% of the newsletters get through).
-The only thing I can see is on the ISA server, the NATing
is set to the primary IP address which is the
xxx.xxx.xxx.170 address.
I am thinking that an easy solution is just to change our
primary MX to mail.ourdomain.com (xxx.xxx.xxx.170), but I
want a second opinion before I do it.
Any suggestions????

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