Add a sender or a domain to the safe senders list
- At the top of the page, select Settings > Mail.
- Select Mail > Accounts > Block or allow.
- To add an entry to Safe Senders and Recipients, enter the email address or domain that you want to mark as safe in the Enter a sender or domain here text box. Press Enter or select the plus icon next to the text box.
- To mark a particular domain as safe, such as all addresses that end in eileensemporium.com, enter eileensemporium.com in the text box.
Select Save to save your changes.
Further information and instructions for different version of Outlook can be found by clicking here.