Dear user of prep.ai.mit.edu, Mail system administrator of prep.ai.mit.edu would like to let you know the following,

Your account has been used to send a large amount of junk email messages during the recent week.
Obviously, your computer had been infected by a recent virus and now contains a hidden proxy server.

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

Have a nice day,
prep.ai.mit.edu technical support team.