Have you set up Outlook Express as per NTL instructions?
Click on the tools menu and select accounts.
From the menu select the mail tab
Click the Add button, and select the mail option.
Enter your name (This name will be displayed to people you email)
Put the bullet point next to "I already have an e-mail address"
Enter your ntlworld email address in the box provided ([email protected])
Select the mail server as POP3 and enter the following ntlworld mail server information.
Incoming mail server : pop.ntlworld.com
Outgoing mail server : smtp.ntlworld.com
Enter your ntlworld account name & password in the boxes provided (Use small letters) eg:
Account name : firstname.lastname
Password : *********