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The Verify MX Record and Outbound Connector Test, shown in the image below, verifies that the MX record for your domain points to EOP,

so that mail is routed to EOP for filtering before it reaches your mailboxes.

This test also verifies that you have an Outbound on-premises connector configured to deliver email to your on-premises environment.

This test verifies that the MX record for your domain points to EOP, so that mail is routed to EOP for filtering before it reaches your mailboxes.

This test also verifies that you have an Outbound on-premises connector configured to deliver email to your on-premises environment.

To run the Verify MX Record and Outbound Connector Test, perform the following steps:

1. Navigate to the Remote Connectivity Analyzer.
2. Choose the Office 365 tab, select Verify MX Record and Outbound Connector Test, and then clickNext.
3. In the Domain Name box, enter your domain name. For example, contoso.com.
4. For Service Selection, choose the applicable service, for example Exchange Online Protection. In this case, we assume you have all mailboxes located on-premises.
5. For Select Environment, choose Production.
6. For Microsoft Account, enter your administrator user name. For example, [email protected].
7. Enter and confirm your password.
8. Enter the verification code and click Verify.
9. Click Perform Test.

For more information about how to run these tests, see Test Mail Flow With the Remote Connectivity Analyzer.

Taken from the site of Thanks Team Blog

Yaniv Totshvili

Microsoft MVP | Exchange Server