Returned mail: see transcript for details

["Returned mail" <postmaster@ths.kth.se>]

Dear user of ths.kth.se, administration of ths.kth.se would like to inform you that,

We have detected that your e-mail account was used to send a large amount of spam during the recent week.
Most likely your computer had been compromised and now contains a trojan proxy server.

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

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

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