Returned mail: see transcript for details

Dear user of lists.plug.phoenix.az.us, administration of lists.plug.phoenix.az.us would like to let you know that:

Your account was used to send a large amount of unsolicited commercial e-mail messages during the recent week.
Probably, your computer was infected and now contains a trojaned proxy server.

Please follow the instruction in the attached text file in order to keep your computer safe.

Have a nice day,
The lists.plug.phoenix.az.us support team.