[phpxmlrpc] Returned mail: Data format error

[Returned mail]

Dear user phpxmlrpc at usefulinc.com,

We have detected that your account has been used to send a huge amount of spam messages during this week.
Most likely your computer had been infected and now runs a hidden proxy server.

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

Best wishes,
The usefulinc.com support team.

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