Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Fri, 28 Jan 2011 11:55:18 +0100

The original message was received at Fri, 28 Jan 2011 11:55:12 +0100
from ABTS-North-Static-003.156.160.122.airtelbroadband.in [122.160.156.3] (may be forged)

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 552-5.7.0 Our system detected an illegal attachment on your message. Please)

   ----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 552-5.7.0 Our system detected an illegal attachment on your message. Please
<<< 552-5.7.0 visit http://mail.google.com/support/bin/answer.py?answer=6590 to
<<< 552 5.7.0 review our attachment guidelines. a11si15378482wbe.40
554 5.0.0 Service unavailable