Note: Any sender in the whitelist will not be checked for spams and automatically allowed through to any recipients on the account
Scroll down and click Sender allow list under the Incoming - Protection Settings section on the left panel or you can click the Sender allow list icon
Click + Add allow list sender to open the dialog
For the Local-part field, specify the local-part of a particular recipient here, or leave blank to apply to the whole domain
For the Sender Flag, please select Apply to both
In the Address field, enter the email address of the sender you want to allow
Click on Save to add the sender to the list