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All about appropriating email adresses

I've received email I've never sent. How does it work? Here are some examples of subject:

Delivered-To: postmaster@1
Received: (qmail 18343 invoked by uid 505); 20 Oct 2003 13:46:29 -0000
Received: from unknown (HELO localhost) (
by with SMTP; 20 Oct 2003 13:44:51 -0000
To: Postmaster
X-Mailer: The Bat! (v1.61)
X-Priority: 2 (High)
Subject: your account sqestwut
MIME-Version: 1.0

Often it's spam send by spammers. They use existing email addresses, such as Then they have more change that the message will be received and not deleted immediately. This message was sent to non-existent recipient, that is why the email returned to the address it was send from.

There isn't a solution to this problem. We cannot block the emails returning to because this is a real address.
You may at least try to filter messages by subject:
Log into Manager v3.
Choose "Emails" , then "POP accounts" and next "Filters" . Create an appropriate filter for your problem.