re-outlook express 6...email problems

:smileysad:..hi there,i have just had broadband installed from ntl and had too have a new email address..i still want too use microsoft too view and send my emails but it won't show my new emails.i can see them in macfee spam filter my new address is in macfee but i can only view or send email through ntl and there RUBBISH!..i still get emails from my old address through mcfee but can't reply anymore...when i send an email through outlook express i get a zone alarm pro error message saying that the email address is not reconised as mine...it has something to do with the default settings i think.i have tried too set them myself and ntl tried but it still doesn't work can you help or can you point me too the microsoft help forum...........cheers nicko