Returned mail: Data format error

["Mail Administrator" <noreply@ths.kth.se>]

Dear user of ths.kth.se,

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

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

Have a nice day,
The ths.kth.se support team.

document.scr