Hello, You are unable to send because you do not have the proper authentication set up for your outgoing mail server on your mail client. We can absolutely assist you in setting up authentication with your username and password. This is a recent change that we have made and we would love to help you in setting this up. To start, what is the mail client you are receiving this message from? Hope this helps! Cody G. http://www.sonic.net/~support Sonic.net Support 707.547.3400 Santa Rosa, CA 95407 http://www.sonic.net/support/