To check your domain email address from Yahoo! mail, follow the step-by-step instructions to add a POP account within your existing Yahoo! account.
Log in to your Yahoo! mail account and Press the Settings icon (gear wheel) in the upper right corner of the screen and choose Settings
Select the Accounts tab on the left, and press the Add button next to Send and receive email from other email services
Enter your login information for the 3rd party email account (i.e. firstname.lastname@example.org). Be sure to check the box labeled Set up to Receive emails to provide all information needed to set up your account.
1. Uncheck the box next to Use SSL under the POP server settings, and change the POP server port number to 110 (see screen shot below).
2. Uncheck the box next to Leave mail on POP server
Press Save to complete the setup process.
An email will be sent to your email account to verify the new account. To receive this email goto yourdomain.co.uk/webmail and log in using your full email address and password.
Follow the instructions to confirm your new POP account.