I have registered some email address on some website. For example: ***@btamail.net.cn and the POP3 Server is btamail.net.cn the smtp server is btamail.net.cn. How to configure on the ISA to allow the user behind the ISA can send&received the email from btamail.net.cn. I have created a protocol rule that allow all IP trafic to transfer. But I still can't send and receive the email.