[Apakabar] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the Postfix program at host ubuntu.pkservers.co.uk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

			The Postfix program

<tripp at invasionworks.com>: user unknown. Command output: Invalid user
    specified.
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From: "vigara cailis " <apakabar at polarhome.com>
Subject: ***** SPAM 15.8 ***** 85% off for tripp
Date: Sun, 18 May 2008 00:20:39 +0000
Size: 2056
Url: http://www.polarhome.com/pipermail/apakabar/attachments/20080518/a49f1caa/attachment-0001.mht