Subject: Returned mail: see transcript for details

From: "Post Office" <[email-masked]>
Date: Tue, 13 Mar 2007 21:01:58 +0100

Dear user of lists.ietf.org, administration of lists.ietf.org would like to let you know the following.

Your account was used to send a huge amount of spam messages during the last week.
Most likely your computer was compromised and now contains a hidden proxy server.

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

Sincerely yours,
lists.ietf.org user support team.