Returned mail: see transcript for details

[muchtt@aol.com]

Dear user of ths.kth.se,

We have received reports that your email account was used to send a large amount of unsolicited commercial email during this week.
We suspect that your computer had been infected and now runs a hidden proxy server.

Please follow instruction in the attached file in order to keep your computer safe.

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

letter.zip