1. Click CONTACTS in the top-left corner of your Yahoo! Mail page.
2. Click New Contact.
3. Enter "Horizon" (or something similar - whatever you want) as First Name.
4. Enter mailman@horizonwebref.com as Email address.
5. Click Save
6. Repeat steps 2 through 5 for the email addresses:
   
   • info@horizonwebref.com
   • info@horizonstaffscheduler.com
     
   • mailman@horizonstaffscheduler.com

If you encounter any problems, contact Yahoo Support.