Mail delivery failure

****** Message from InterScan VirusWall 6 ******

Sent >>> RCPT TO: <[email protected]>
Received <<< 550 5.1.1 User unknown

Could not deliver mail to this user.
[email protected]
*****************     End of message     ***************
Received: from 41.245.49.177
	by server.iemagazine.local (InterScan VirusWall 6); Tue, 04 Aug 2009 14:23:01 +0200
From: [email protected]
To: [email protected]
Subject: Returned mail: see transcript for details
Date: Tue, 4 Aug 2009 14:17:59 +0200
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Your message was not delivered due to the following reason(s):

Your message could not be delivered because the destination server was
unreachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
tion parameters.

Most likely there is a network problem that prevented delivery, but
it is also possible that the computer is turned off, or does not
have a mail system running right now.

Your message was not delivered within 5 days:
Host 139.181.135.165 is not responding.

The following recipients could not receive this message:
<[email protected]>

Please reply to [email protected]
if you feel this message to be in error.
****** Message from InterScan VirusWall 6 ******

** WARNING! Attached file text.zip contains:

     WORM_MYDOOM.GEN virus in compressed file text.txt                                                                                         .scr

   Attempted to clean the file but it is not cleanable.
   It has been deleted.
*****************     End of message     ***************