When I send mail to my boss (I send only to him), he receives my e-mail with CC to another person (CC to maithuy56@xxxxxxxxx). In my Sent Items, the e-mail doesn't CC to anybody. Some other e-mails he receives also CC to that address. This is very strange because it hasn't happened before and we haven't done any configuration. Do you know any kind of virus or worm can do like this ? It's very urgent. Please help.