Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 27 Aug 2008 03:34:10 +0700 (NOVST)

The original message was received at Wed, 27 Aug 2008 03:34:07 +0700 (NOVST)
from [190.220.63.65]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.7.1 Message rejected (no valid recipients).)

   ----- Transcript of session follows -----
... while talking to [192.168.216.11]:
>>> DATA
<<< 550 5.7.1 Message rejected (no valid recipients).
554 5.0.0 Service unavailable