To add an email address to your mobile Yahoo! Mail contacts (and ensure delivery), follow these steps:

Mobile (Tablet/Phone) Email Apps

  1. Tap the hamburger menu (three stacked lines) in the top left.
  2. Tap Settings and scroll down to Filters.
  3. Select the email account you want to add a filter for.
  4. Tap the icon to add a new filter.
  5. Name it anything you want (such as “Whitelist”), then either:
    • Add the exact email you want to whitelist OR;
    • Add the you want to whitelist to get deliveries from every email at that domain.
  6. Click the icon in the top right to save the filter.

Desktop Yahoo Mail

To whitelist contacts with these email providers:

  1. Click the contact book in the right-hand menu.
  2. At the bottom of the sidebar, click +Add new contact.
  3. Enter the name and email information of the sender you want to whitelist (you can use a business name).
  4. Click Save.