Monitoring Benefit
The Exchange Online Hybrid Mail Flow status test verifies that email is able to be sent and received between an Exchange Online user mailbox, an on-premises Exchange hybrid user mailbox, and an external email address.
Which port the test uses
The Hybrid Mail Flow test sends its messages over SMTP port 25. The port is fixed and cannot be changed to an encrypted submission port such as 587. Support for other ports is a feature request on our product backlog.
Ports 25 and 587 may also appear in the results of the Network indicator. Those are separate port checks, not the port this mail flow test uses.
How do we verify the monitoring test results?
From the ENow web server, open the following URL to follow the instructions on how to sign in to Outlook on the web with the Exchange Online user mailbox:
How to sign in to Outlook on the web - Microsoft Support
Verify in that mailbox that messages are arriving from both the configured external mailbox and the Exchange hybrid mailbox.
To reach the on-premises Exchange hybrid mailbox through Outlook on the web:
Set up Outlook on the web - Exchange | Microsoft Learn
Then access the external mailbox that has been configured with the auto-forwarding rule:
Automatically forward Gmail messages to another account | Gmail Help
Gmail automatic forwarding | Google Workspace Knowledge Center
Common warning or error results, and potential solutions
| Warning or Error | Potential Solution(s) |
| Warning or Error status. |
For the Cloud Mail Flow and Hybrid Mail Flow monitoring tests from the ENow web server, check the Exchange Online User Mailbox settings by opening the ENow Admin Console and selecting Server > Tuning Policy > Settings > Office 365 > Exchange Online > Exchange Online User Mailbox > Verify Credential. For the Hybrid Mail Flow monitoring test from the ENow web server, check the Exchange Hybrid User Mailbox settings by opening the ENow Admin Console and selecting Server > Tuning Policy > Settings > Office 365 > Exchange Online Hybrid Mode > Exchange Hybrid User Mailbox > Verify Credential. For the Cloud Mail Flow monitoring test from the ENow web server, check the External email address settings by opening the ENow Admin Console and selecting Server > Tuning Policy > Settings > Office 365 > Exchange Online > Cloud Mail Flow Tests > External email address. Then review the following: |
| Error indicates the Spam Confidence Level (SCL) in EOP is greater than an SCL value of 1. |
Spam confidence level - Microsoft Defender for Office 365 | Microsoft Learn |
| Error indicates that the inbound message is not received. |
Gmail marks valid email messages as spam | Google Workspace Admin Help |
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