Did you go to '
A Guide to BT Yahoo! Mail' and walk through the (impressive) interactive animation?
I clicked on the 'Step by step guides', 'Setting up email in Outlook Express', 'Manual setup (Mac or Windows)', and finally 'Mac OS' links.
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Based on the information from the animation:
Launch 'Mail', select the 'Mail, Preferences...' menu item, click on the toolbar's 'Accounts' icon button, and then click on the '+' icon button.
Under 'General Information':
Select 'POP' from the 'Account Type:' popup menu, enter a user name (or equivalent) for 'Account Description:' ('dens', for example), enter your 'Full Name' (optional), enter a valid 'Email Address' ('dens@btinternet.com', for example), and then click the 'Continue' button.
Under 'Incoming Mail Server':
Enter 'mail.btinternet.com' as the 'Incoming Mail Server:', User Name (again, if not already filled in), the respective user's Password, and then click the 'Continue' button.
Under 'Incoming Mail Security':
Click the 'Continue' button.
( You can always edit your account's settings later. )
Under 'Outgoing Mail Server':
Enter 'mail.btinternet.com' as the 'Outgoing Mail Server:'.
(
Hmmm, one typically would enter 'smtp.btinternet.com' (as in this example); but then, as per the animation 'mail.btinternet.com' is shown.
So if you fail to send any e-Mails, return to this account and change the 'Outgoing Mail Server' from 'mail.btinternet.com' to 'smtp.btinternet.com'.
)
Make sure the 'User Name:' and 'Password:' fields contain the correct information, and the 'Use Authentication' check box has a check mark present. Click the 'Continue' button.
Under 'Account Summary':
Review the information, clicking the 'Go Back' button to locate and enter any corrections; otherwise, click on the 'Continue' button.
Under 'Conclusion':
Click the 'Create Another Account' button to create an additional e-Mail account, or the 'Done' button.
Under the 'Account Information' tab, and its related 'Server Settings...' button's panel - you should see all the information entered via the steps taken above. Again, you can edit the various fields accordingly.
Once satisfied with the settings, close the 'Accounts' window, and begin using 'Mail'.