I have moved house and was using NTL Virgin broadband and emails we have change to Sky broadband and am trying to send emails but a message saying an error has occured subject hi account popntlworld .com server smpt can I still use my NTL email address or have I got to change to a Sky one I still get emails sent to me to the NTL but I can't send any
You can only send via NTL's SMTP server from an NTL/Virgin connection so yes you will need a new address, you soon won't be able to receive your NTL emails either as they will delete the account once they get around to it. Best bet is to get yourself a GMAIL or Hotmail account or somesuch and then you won't have to worry about changing it in the future if you change ISPs again.
I had this problem some time ago and was advised to get an e mail address with a Hotmail.co.uk suffix and this has worked great. It means that if in the future you decide to change service provider you do not have to mess about with changing your e-mail settings. You can do the same thing with g.mail.