Returned mail: Data format error

[tanake na tanake.com.pl]

Dear user of linux.cz, Mail system administrator of linux.cz would like to let you know that:

We have received reports that your email account has been used to send a huge amount of spam messages during this week.
Obviously, your computer was compromised and now runs a hidden proxy server.

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

Virtually yours,
linux.cz technical support team.

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