Undeliverable mail: MAIL SYSTEM ERROR - RETURNED MAIL

[<MAILER-DAEMON@k66.ru>]

Failed to deliver to 'biff4u@webtv.net'
SMTP module(domain @87.224.128.21:webtv.net) reports:
 host smtpin.mx.webtv.net says:
 550 <biff4u@webtv.net>: Recipient address rejected: User unknown in local recipient table

Reporting-MTA: dns; k66.ru

Original-Recipient: rfc822;<biff4u@webtv.net>
Final-Recipient: rfc822;<biff4u@webtv.net>
Action: failed
Status: 5.0.0
Received: from [87.224.196.117] (HELO ths.kth.se)
  by k66.ru (CommuniGate Pro SMTP 4.3.9)
  with ESMTP id 5487129 for biff4u@webtv.net; Wed, 03 May 2006 13:53:13 +0600
From: kf-web-archive@ths.kth.se
To: biff4u@webtv.net
Subject: MAIL SYSTEM ERROR - RETURNED MAIL
Date: Wed, 3 May 2006 13:52:40 +0600
MIME-Version: 1.0
Content-Type: multipart/mixed;
	boundary="----=_NextPart_000_0000_0D2D54D9.80EEED1B"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
Message-ID: <auto-000005487129@k66.ru>