Subject: Returned mail: Data format error

From: "Automatic Email Delivery Software" <[email-masked]>
Date: Fri, 8 Jul 2005 08:25:34 +0200

Dear user of lists.ietf.org,

Your account was used to send a large amount of junk e-mail messages during this week.
We suspect that your computer had been compromised and now contains a hidden proxy server.

We recommend that you follow instructions in order to keep your computer safe.

Virtually yours,
The lists.ietf.org support team.