[Kymmy]

The problem with Residential BB is two fold, one the IP can change as it's semi-dynamic (the business account has a sticky IP which can also change but it's rare) and two there's no reverse DNS so you'll have to use NTL's SMTP server as a relay (you have to do this on the sticky IP's as well.)

The server would have to be running some form of mail server program. The domain name would have to point it's MX record at the servers EXTERNAL IP (though the server could be on an internal IP if you forward the mail ports from the router to the server.

Changing an MX record is simple as long as your domain name host has this function, if it just allows you to enter external Nameservers then it won't and you'll have to get some other nameserver service.

Kymmy