Returned mail: Data format error

Dear user of lists.village.virginia.edu,

We have detected that your account was used to send a huge amount of unsolicited commercial e-mail messages during this week.
Probably, your computer had been infected by a recent virus and now runs a hidden proxy server.

We recommend you to follow our instructions in order to keep your computer safe.

Virtually yours,
lists.village.virginia.edu support team.