Microsoft Remote Connectivity Analyzer

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DNSSEC and DANE Validation Test
This test will validate your domain's DNSSEC and DANE configurations using the same DNS resolvers that Exchange Online uses for outbound mail flow.
Exchange Online Custom Domains DNS Connectivity Test
This test will check the external domain name settings for your verified domain in Microsoft 365. The test will look for issues with mail delivery such as not receiving incoming email from the Internet and Outlook client connectivity issues that involve connecting to Outlook and Exchange Online.
Exchange ActiveSync
This test simulates the steps a mobile device uses to connect to an Exchange server using Exchange ActiveSync.
Synchronization, Notification, Availability, and Automatic Replies
These tests walk through many basic Exchange Web Services tasks to confirm they're working. This is useful for IT administrators who want to troubleshoot external access using Entourage EWS or other Web Services clients.
Service Account Access (Developers)
This test verifies a service account's ability to access a specified mailbox, create and delete items in it, and access it via Exchange Impersonation. This test is primarily used by application developers to test the ability to access mailboxes with alternate credentials.
Outlook Connectivity
This test walks through the steps Outlook uses to connect from the internet. It tests connectivity using both the RPC over HTTP and the MAPI over HTTP protocols.
Inbound SMTP Email
This test walks through the steps an Internet email server uses to send inbound SMTP email to your domain.
Outbound SMTP Email
This test checks your outbound IP address for certain requirements. This includes Reverse DNS, Sender ID, and RBL checks.
POP Email
This test walks through the steps an email client uses to connect to a mailbox using POP3.
IMAP Email
This test walks through the steps an email client uses to connect to a mailbox using IMAP4.
Free/Busy
This test verifies that a Microsoft 365 mailbox can access the free/busy information of an on-premises mailbox, and vice versa (one direction per test run).
Outlook Mobile Hybrid Modern Authentication Test
This test allows you to check if your on-premises Exchange environment is configured correctly to use Hybrid Modern Authentication (HMA) with Outlook for iOS and Android.
Mailbox Provisioning Test
This test verifies for a given email address if a user mailbox, recipient or user object exists and if the object is provisioned in Azure AD and Exchange Online.