How to disable the Microsoft 365 spam filtering


An admin login to the customer Microsoft 365 portal

The Process

Log in to M365 using the customer GA credentials.
Click into the Exchange admin centre in the left menu (you may need to click to Show All)
In the left menu, click into Mail Flow, Rules.

Click the down arrow next to the '+', and choose Bypass Spam Filtering

Give the rule a name, and then in the 'Apply this rule if' pull down choose
The sender
Is External/Internal
And choose Outside the organisation

Click Save

The rule details in the right pane should now read