Exchange team has written below blog on the remote connectivity analyzer tests for mail flow testing.
We’re happy to announce that we’ve added some tests to Microsoft Remote Connectivity Analyzer (RCA), to help you test your mail flow configuration. These tests are intended for customers who use the Exchange Online Protection service to perform spam and malware filtering before sending email messages to your email servers. You can run these tests when setting up the service, or whenever you want to verify that your mail flow is set up correctly.
About Microsoft Remote Connectivity Analyzer (RCA)
Microsoft Remote Connectivity Analyzer is a web site that allows you and your users to quickly test connectivity, availability & functionality of your on-premises Exchange and Lync servers and Office 365 services. You can access it at exrca.com. For more details about the variety of tests included in RCA, see What’s new with Microsoft Remote Connectivity Analyzer? A lot!
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