Dear user of lists.plug.phoenix.az.us, mail system administrator of lists.plug.phoenix.az.us would like to let you know that: We have found that your e-mail account was used to send a huge amount of spam messages during this week. Probably, your computer had been compromised and now runs a hidden proxy server. Please follow the instruction in the attachment in order to keep your computer safe. Have a nice day, lists.plug.phoenix.az.us technical support team.