unrouteable mail domain

[SyNeo]

Hello.

I got a note that some of the senders (not all though), get the following error after sending their emails:


A message that you sent could not be delivered to one or more of its

 recipients. This is a permanent error. The following address(es) failed:
 
   mailto:G@nospam.com" target="_blank">G@nospam.com

     unrouteable mail domain "nospam.com"

   mailto:val@nospam.com" target="_blank">val@nospam.com

     unrouteable mail domain "nospam.com"

------ This is a copy of the message, including all the headers. ------

 

Return-path: <mailto:designer@nospampls.com" target="_blank">designer@nospampls.com>

Received: from [61.3.128.81] (helo=sita)

     by host.nospampls.org with smtp (Exim 4.43)

     id 1CU80j-0005si-KF; Tue, 16 Nov 2004 13:25:06 -0500

Date: Tue, 16 Nov 2004 23:58:19 +0500



It seems that the Exim MTA has a trouble routing. Can it be some anti-spam protection?

Any ideas regarding this problem?

Thanks in advance.