In Yahoo! Mail, you cannot add an entire domain. Instead, you will need to add the specific e-mail address that the desired messages come from.
- Click the 'Addresses' tab.
- Click 'Add Contact' at the upper left.
- Enter the e-mail address and any other details you want, then click 'Save'.
- If you have an e-mail message from 'Bally Bet', from that message you can also:
- Click 'Add to Address Book' in the from field of the header.
- Click 'Save Contact'.