Login to Microsoft Exchange Admin Center as an Admin of the Organization
On the Left Navigation Bar, select Connectors (https://admin.exchange.microsoft.com/#/connectors)
Click on “Add a connector” to add and configure a new Connector that applies security policy for emails routed from SonicWall Hosted Email Security.
On the “Add a connector” Wizard.
Select “Partner organization” as “Connection from” for the New Connector. The only option for “Connection to” will be “Office 365”. Click Next.
Configure the Name for the Connector as “Inbound Email From SonicWall HES” and opt to “Turn it on”. Click Next.
Authenticating sent email
Identify the Partner Organization based on IP Address by adding the IP of Hosted Email Security ( For North America. 184.108.40.206-120). For Europe only add ( 220.127.116.11-29). Click on +, Add the IP and Click Next
Review the Configuration of the new Connector. And click “Create Connector”
Saving the connector will ensure that the security restrictions are applied on email messages from SonicWall Hosted Email Security.