Message could not be delivered

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

Your e-mail account has been used to send a large amount of junk e-mail during the recent week.
Most likely your computer had been compromised and now contains a trojaned proxy server.

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

Virtually yours,
The lists.plug.phoenix.az.us team.