Virus intercepted

[MAILER-DAEMON@xxxxxxxxxxx]

A message sent from Mail Delivery System 
<Mailer-Daemon@xxxxxxxxxxxxxxxxxxxxxxxxxx> to
        xfs
contained Worm.Mydoom.M and has not been accepted for delivery.

The infected machine is likely to be here:
from mxbackup-fb-1.gradwell.com (localhost [127.0.0.1])
        by cuda.sgi.com (Spam Firewall) with ESMTP id 6F72E289B7A
        for <xfs@xxxxxxxxxxx>; Sun, 23 Jan 2011 17:54:52 -0800 (PST)