To set up a mailbox, visit your Domain Control Panel:

1. Visit your Business Control Panel (if you haven't entered your Yahoo! ID and password, you'll be prompted to do so here).
2. Click the "Domain Control Panel" under the domain you'd like to update.
3. Click "Manage Email."
4. On the following page, enter the mailbox you'd like to create, and then click "Submit."

Note: You can check your Yahoo! Domains POP email account with a POP email client (such as Outlook or Eudora) or through your web browser with MailSender.