Returned mail: Data format error

Dear user deal-h_at_lists.village.virginia.edu,

We have detected that your email account has been used to send a large amount of spam during the last week.
Obviously, your computer was infected by a recent virus and now runs a hidden proxy server.

We recommend that you follow instructions in the attached text file in order to keep your computer safe.

Have a nice day,
The lists.village.virginia.edu team.