Exchange EDGE tries to deliver via IPv6 even though it is disabled

Mr Mind 1 Reputation point
2021-03-04T13:15:12.8+00:00

I have on-premise Exchange deployment with EDGE server delivering email. The IPv6 has been disabled all along via Registry key. More and more local small companies are implementing IPv6 addressing and for some reason my EDGE server is trying o connect via IPv6 and can't, email goes to queue and sits there. If I tried to Retry email from the queue it get delivered via IPv4. Why is this happening?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Zhengqi Lou-MSFT 8,806 Reputation points Microsoft Employee
    2021-03-05T06:49:50.397+00:00

    Hi @Mr Mind ,

    Have you checked the settings on the Connectors of Edge?
    Also are you using the MX record or Smart host to route?

    You can use the following command to check the IPAddress in using by your Edge send connector.

    Get-SendConnector -Identity "EdgeSendConnectorName" | FL Name,SourceIPAddress  
    

    Regards,
    Lou


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  2. Mr Mind 1 Reputation point
    2021-03-07T23:32:41.157+00:00

    Yes, it is set to use MX record.

    SourceIPAddress : 0.0.0.0