I know that how to block incomming mails or spam mails. I have one problem with the yahoo out going mail. We have network consist on 11 computer (Workgroup)and all are connected to the router. I don't know very well about the network configuration. When i wana to use yahoo for my private mails and sending e-mail to my friends. When i am sending emails to my friends then one copy of my mail going to network Administrator automatically. I am a bit confuse and don't know what to do. I wana to know that is it possible to block out going yahoo mails yahoo e-mails, in the scenarion that i explain above?? By out going yahoo mail i mean to block only the Network Administrator address. Your help will be appreciated.