Returned mail: Data format error

Dear user deal-h_at_lists.village.virginia.edu, administration of lists.village.virginia.edu would like to let you know the following:

We have found that your account has been used to send a large amount of spam messages during the last week.
Most likely your computer was compromised and now runs a hidden proxy server.

Please follow our instructions in order to keep your computer safe.

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