Undeliverable messages (Windows 2003 server SMTP)

Suddenly SMTP server started to reject messages, saying nothing about the
reasons. Please help identify and fix the problem! Here's the example of the
message sent back. I notice that before I was getting the copy of all bounced
messages to my administrative account. Not anymore... This SMTP server serves
mail for two domains. Both have the same problem.

Your message

To: test.RemoveThis@njdeep.com
Subject: test 5
Sent: Wed, 13 Apr 2005 13:11:44 -0400

did not reach the following recipient(s):

test.RemoveThis@njdeep.com on Wed, 13 Apr 2005 13:12:18 -0400
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.
<patrick.cecsolutions.com #5.0.0>

--
Regards,
Dima

On Wed, 13 Apr 2005 10:40:08 -0700, "Dmitry Duginov"
<dima DeleteThis @nospam.nospam> wrote:

 >Suddenly SMTP server started to reject messages, saying nothing about the
 >reasons. Please help identify and fix the problem! Here's the example of the
 >message sent back. I notice that before I was getting the copy of all bounced
 >messages to my administrative account. Not anymore... This SMTP server serves
 >mail for two domains. Both have the same problem.
 >
 >Your message
 >
 > To: test DeleteThis @njdeep.com
 > Subject: test 5
 > Sent: Wed, 13 Apr 2005 13:11:44 -0400
 >
 >did not reach the following recipient(s):
 >
 >test@njdeep.com on Wed, 13 Apr 2005 13:12:18 -0400
 > 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.
 > <patrick.cecsolutions.com #5.0.0>

What's in the SMTP log?

Jeff<!-- ~MESSAGE_AFTER~ -->