[rt-users] RT not sending email

[Evan M.]

RT is not sending email at all, not to the admins and not to the users.  It
was working fine 2 weeks ago, then it stopped sending mail.  All the scrips
are fine, to the best of my knowledge.  I am not the person who set up RT so
I'm a little in the dark here.  The root mail log is receiving the mail but
that's where the trail ends.  I'll post the log shortly.  We are running RT
v3.6.3 and Fedora 6.  I've tried just about everything I could find online
and in this forum but none have helped so far.  Any help would be greatly
appreciated.  Thanks in advance.

::Edit::
Here is the mail log:
   ----- The following addresses had permanent fatal errors -----
<admin_b at email.com>
<admin at email.com>
<admin_a at email.com>

   ----- Transcript of session follows -----
550 5.1.2 <admin_a at email.com>,<admin at email.com>,<admin_b at email.com>... Host
unknown (Name server: bbinslv.com: host not found)

--l9TFsESo012110.1193673254/bblvlinux.com
Content-Type: message/delivery-status

Reporting-MTA: dns; **linux.com
Received-From-MTA: DNS; **linux.com
Arrival-Date: Mon, 29 Oct 2007 11:54:14 -0400

Final-Recipient: RFC822; admin_b at email.com
Action: failed
Status: 5.1.2
Remote-MTA: DNS; email.com
Last-Attempt-Date: Mon, 29 Oct 2007 11:54:14 -0400

Final-Recipient: RFC822; admin at email.com
Action: failed
Status: 5.1.2
Remote-MTA: DNS; email.com
Last-Attempt-Date: Mon, 29 Oct 2007 11:54:14 -0400

Final-Recipient: RFC822; admin_a at email.com
Action: failed
Status: 5.1.2
Remote-MTA: DNS; email.com
Last-Attempt-Date: Mon, 29 Oct 2007 11:54:14 -0400
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