Mail server misconfigured?

[Ryan Golhar]

Hi,

I have a local mail server set up to email users when their particular
task on a larger system has been completed.

For users within our domain, it works fine, however when users outside
of our domain are emailed, the email is routed through another mail
server within our domain.  I always get messages such as the following
back.  

I'm not an expect with mail systems (and I honestly haven't done a lot
of research into it) so I'm guessing that my mail server is not
configured correctly.  I need to reconfigure it to connect to the
appropriate destination mail server (if possible) to deliver mail.  

Can anyone provide any guidance?  Thanks,

Ryan


-----Original Message-----
From: Mail Delivery Subsystem [mailto:MAILER-DAEMON at serine.umdnj.edu] 
Sent: Tuesday, October 31, 2006 12:20 PM
To: apache at serine.umdnj.edu
Subject: Returned mail: see transcript for details

The original message was received at Tue, 31 Oct 2006 12:20:09 -0500
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<someuser at someplace.org>
    (reason: 550 Cannot relay. Mailbox not available
someuser at someplace.org)

   ----- Transcript of session follows -----
... while talking to mymailserver.mydomain.edu.:
>>> RCPT To:<someuser at someplace.org>
<<< 550 Cannot relay. Mailbox not available someuser at someplace.org 550
5.1.1 <someuser at someplace.org>... User unknown