Virus intercepted

[MAILER-DAEMON@xxxxxxxxxxx]

A message sent from Email Maintanance <accessmaintanance1@xxxxxxxxxx> to
        xfs
contained Email.Phishing.Webmail-5 and has not been accepted for delivery.

The infected machine is likely to be here:
from n1b.bullet.mail.aue.yahoo.com (localhost [127.0.0.1])
        by cuda.sgi.com (Spam Firewall) with SMTP id 536AF2F66F5
        for <xfs@xxxxxxxxxxx>; Tue, 27 Apr 2010 10:29:34 -0700 (PDT)