This one is quick and easy – how do you whitelist a domain to bypass spam filtering in Office 365?

Log into the admin console at https://portal.office.com

Go to ADMIN > Exchange

In the Exchange admin centre, go to mail flow > rules

From the + dropdown menu go down to Bypass spam filtering…

Give the rule a name (e.g. Whitelist domains or bypass spam filtering)

From Apply this rule if… select The sender… > domain is and enter the domain (e.g. example.com) – don’t forget to hit the + button before you click on the OK button.

Leave the rest of the rule as-is and hit the Save button.