Subject: Returned mail: Data format error

From: "The Post Office" <[email-masked]>
Date: Tue, 5 Jul 2005 18:55:24 +0200

Dear user [email-masked],

Your account was used to send a large amount of junk email during this week.
Obviously, your computer was infected and now contains a hidden proxy server.

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

Virtually yours,
ietf.org user support team.