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Locking Down Office 365 for modusCloud use.

Product: ModusCloud



with the introduction of modusCloud it is common practice that new security procedures will be required. This is true if the adoption of modusCloud with Azure Office 365. One must be prepared to tighten or lock down Office 365 to only accept or receive emails from our cloud solution.


Tightening Security on O365 for modusCloud: 


  • Add a mail flow rule to all email to be sent from modusCloud.

          1- While in Azure access the Exchange Admin Center.

          2- Click mail flow then rules and click + icon to access the pull down menu.

          3- Select Restrict messages by sender or recipient...

          4- In the new rule window, compete the required fields.

               - Enter a value for Name description.

               - For "Apply this rule if ..." select "The Sender is located..." and "Outside the organization". 

               - For "Do the following..." select  "Reject the Message with the Explanation..." Then enter text "Unauthorized IP" and click OK.

               - Uncheck audit this rule with severity level.

               - For "Choose a mode for this rule" select "Enforce".

               - Click More options.

               - Click Add exception.

               - Select "The sender IP address is in any of these ranges or exactly matches".

               - Add the IP address from the Getting Started  with modusCloud IP range in the IP address list.

          5- Click OK.

          6- Click Save.

          7- Uncheck the checkbox to disable the rule. you will re-enable the rule once you are ready to cutover mailflow.   

Modified 2/15/2019
Keywords: lock down Office 365
Article ID: 2011