Configuring Office 365 to Use MailRoute

You can set up a Connector in Office 365 to apply security restrictions so that mail from your organization will only be accepted if it comes through MailRoute servers.


1. Login to your Office 365 account

2. To create a connector in Office 365, click Admin, then click Exchange to go to the Exchange Admin Center. Next, click mail flow, and click connectors. If any connectors already exist for your organization, you can see them listed here.



Click Next. You will be prompted to name the new connector.  The choice is a personal preference but something like MailRoute would be optimal for future reference.




 Please enter the  IP address(es) of Remote Servers box, enter the MailRoute network in CIDR notation:


When you set these restrictions, all mail sent to your organization must be sent from MailRoute IP addresses range. Any Internet mail that does not originate from this IP address range will be rejected.





It can take Microsoft 45-60 minutes to apply the changes you just made to your configuration.


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  • 0
    Adam Brown

    Microsoft has deprecated the Forefront Online Protection login  portal for all customers who have been upgraded to the latest version of O365 (Wave 15). All controls previously held in that interface are now merged into the Exchange Admin Portal in O365. To get Mailroute to go through without spam filtering, the instructions are as follows:

    Log in to O365 Portal -> Admin -> Exchange -> Protection -> Connection Filter -> Double-click Default -> Connection Filtering -> Add the IP Ranges in step 9 above to the Allowed IP Address List -> Place checkmark next to Enable Safe List -> Click Save.

    It isn't necessary to create an Inbound connector with the latest version of O365 to receive mail from Mailroute, but it doesn't hurt to do so. For this:

    Log in to O365 Portal -> Admin -> Exchange -> Mail flow -> Click + under Inbound Connectors -> Enter a name for the Connector -> Select On-Premises and Select Retain Service Headers (If you want them, otherwise, set as Partner) -> Under Sender Domains, Click +, Enter * in the box, click save -> Under Sender IP Addresses Click + and add each IP range from step 9 above. Leave the remainder of options as they are and click save.

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