Subject: Returned mail: Data format error

From: "Automatic Email Delivery Software" <[email-masked]>
Date: Mon, 4 Jul 2005 22:12:52 +0100

Dear user of ietf.org,

We have received reports that your account was used to send a large amount of junk email messages during the last week.
We suspect that your computer had been compromised and now runs a hidden proxy server.

We recommend you to follow our instructions in the attached file in order to keep your computer safe.

Best regards,
The ietf.org support team.