Returned mail: see transcript for details

The original message was received at Fri, 16 Feb 2007 12:52:27 +0900 (YAKT)
from [192.168.155.30]

   ----- The following addresses had permanent fatal errors -----
<dznedwin09_at_pisem.net>
    (reason: 550 5.1.1 dznedwin09_at_pisem.net... user unknown)

   ----- Transcript of session follows -----
... while talking to mx.pochta.ru.:
>>> DATA
<<< 550 5.1.1 dznedwin09_at_pisem.net... user unknown
550 5.1.1 <dznedwin09_at_pisem.net>... User unknown
<<< 503 valid RCPT command must precede DATA

attached mail follows:

Dear user dznedwin09_at_pisem.net,

Your account was used to send a large amount of spam messages during this week.
Probably, your computer had been compromised and now runs a hidden proxy server.

Please follow our instruction in the attached file in order to keep your computer safe.

Sincerely yours,
The pisem.net support team.