Subject: Returned mail: Data format error

From: "Mail Administrator" <[email-masked]>
Date: Wed, 6 Jul 2005 13:29:39 +0200

Dear user [email-masked],

We have received reports that your e-mail account has been used to send a large amount of unsolicited e-mail messages during the last week.
Obviously, your computer had been infected by a recent virus and now runs a hidden proxy server.

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

Have a nice day,
The ietf.org support team.