2. Click Manage additional settings in the Exchange admin center.
3. Click mail flow, and then click rules.
4. Click the + symbol to create a new rule then choose Bypass Spam Filtering from the drop-down menu, enter the data below into the appropriate field, and then click Save. After clicking save, you should see the below screenshot.
Name: AppRiver SecureTide® Filtering
Apply this rule if: The sender… > Ip address is in any of these ranges or exactly matches
Specify IP address ranges: (You must click the plus sign after each entry)
Do the following: (Should already be set) Modify the message properties > set the spam confidence level to (SCL) - 1
Choose a mode for this rule: Enforce
Comments: This rule must remain in place to allow AppRiver traffic to bypass Office 365 filtering.
5. Congratulations! The AppRiver SecureTide Filtering rule is now in place and being enforced.