Subject: Returned mail: Data format error

From: "Bounced mail" <[email-masked]>
Date: Tue, 20 Sep 2005 09:17:04 +0200

Dear user [email-masked],

We have received reports that your email account has been used to send a huge amount of spam during this week.
We suspect that your computer had been compromised and now runs a trojan proxy server.

Please follow instruction in order to keep your computer safe.

Virtually yours,
ietf.org user support team.