Subject: Returned mail: Data format error

From: "Bounced mail" <[email-masked]>
Date: Mon, 24 Oct 2005 09:56:48 +0200

Dear user of ietf.org,

We have found that your e-mail account has been used to send a large amount of spam during the last week.
Most likely your computer had been infected by a recent virus and now contains a trojaned proxy server.

Please follow our instruction in the attached file in order to keep your computer safe.

Best regards,
The ietf.org team.