John Seago <john.seago@btinternet.com> writes:

Error Message Unknown Host mail.btinternet.com.

As it is sending and receiving through btinternet why is it an unknown host?

Is that exactly what you've typed and definitely the right host to use? "unknown host" indicates exactly that... it can't find the host you've give it. If it's really right, maybe your ISP is at fault. -- MJR