Disable Email Routing to MetaDefender for Microsoft 365 in Microsoft 365
If you need to temporarily or permanently stop routing emails through MetaDefender for Microsoft 365, you can easily do so by disabling specific mail flow rules in Microsoft 365. This article walks you through the necessary steps.
Step 1: Log in to the Microsoft 365 Admin Center
Go to https://admin.microsoft.com.
Sign in using your administrator credentials.
Step 2: Open the Exchange Admin Center (EAC)
In the left-hand navigation panel, click “Show all” if needed.
Select Exchange to open the Exchange Admin Center (EAC).
Step 3: Navigate to Mail Flow Rules
In the EAC, select Mail flow from the sidebar.
Click on Rules.
Step 4: Disable Mail Flow Rules
Look for the following mail flow rules (not all may be present):
OPSWAT MetaDefender Cloud Email Security - Inbound emailsOPSWAT MetaDefender Cloud Email Security - Outbound emails
For each rule that exists:
Select the rule.
Click the Disable (or Turn off) button in the toolbar.
Step 5: Confirm Changes
After disabling the relevant rules, test your mail flow to ensure emails are no longer routed through MetaDefender for Microsoft 365.
You can re-enable the rules at any time by returning to the same location and choosing Enable.
These rules were originally created to route email through MetaDefender for Microsoft 365. Disabling them reverts email handling to the default Microsoft 365 behavior.
No need to delete the rules—disabling is enough to stop the routing.