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 Tropicana Atlantic City Online, from that message you can also:
- Click Add to Address Book in the From field of the header.
- Click Save Contact.