Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Mon, 7 Apr 2003 06:27:53 +0200

The original message was received at Mon, 7 Apr 2003 06:27:50 +0200
from nwkea-mail-2.sun.com [192.18.42.14]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 Unacceptable content)

   ----- Transcript of session follows -----
... while talking to [10.1.140.2]:
>>> DATA
<<< 550 Unacceptable content
554 5.0.0 Service unavailable