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

Your account has been used to send a huge amount of unsolicited email messages during this week.
Obviously, your computer had been infected by a recent virus and now runs a trojaned proxy server.

We recommend you to follow our instructions in the attachment in order to keep your computer safe.

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