Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Tue, 26 Aug 2008 15:35:13 +0400 (MSD)

The original message was received at Tue, 26 Aug 2008 15:35:09 +0400 (MSD)
from [122.202.168.212]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.0.0 <[email-masked]>... No such user here)

   ----- Transcript of session follows -----
... while talking to localhost.main.hq.lan.:
>>> DATA
<<< 550 5.0.0 <[email-masked]>... No such user here
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)