Exchange Server Send Connector

Mark TT 146 Reputation points
2021-03-28T11:57:10.343+00:00

Hi ,
We've multiple exchange 2010 and exchange 2016 and running on coexistence mode.
A send connector with domain * and source server 2010.
B Send connector with domain gmail.com and source server 2016.

Mailbox on exchange 2010 will go to exchange 2010 A Send Connector.
Mailbox on exchange 2016 except gmail.com go to exchange 2010 A Send Connector.

After disable A Send Connector, Mailbox on exchange 2010 will receive bounce back.#554 5.4.12 SMTP; Hop count exceeded - possible mail loop detected , it can't route to exchange 2016 B Send connector.

Can we route all the mail traffic to Exchange 2016 B Send connector?

Thanks.

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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Accepted answer
  1. Andy David - MVP 110.4K Reputation points Microsoft MVP
    2021-03-28T11:59:50.2+00:00

    Set the B send connector address space to * and disable send connector A. That will work unless you changed something else.

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5 additional answers

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  1. Mark TT 146 Reputation points
    2021-03-30T14:51:46.333+00:00

    anonymous userDavid @Zhengqi Lou-MSFT The environment too complex , let me take more time to study.
    Thanks for your help.

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  2. Mark TT 146 Reputation points
    2021-03-28T12:03:47.75+00:00

    anonymous userDavid Yes, I've try to config B connector with * and disable send connect A, it can't route correctly, so I'm confuse with the connector.
    Any exchange site configuration need to take care?

    Thanks.


  3. Mark TT 146 Reputation points
    2021-03-28T12:16:22.023+00:00

    anonymous userDavid It say 2016 server reject the message with 554 5.4.12 SMTP; Hop count exceeded - possible mail loop detected on message id .

    If i put
    A Connector with * domain Exchange 2010
    B Connector with * domain Exchange 2016

    It will use Exchange 2010 first and never go to Exchange 2016.

    Thanks.


  4. Zhengqi Lou-MSFT 8,806 Reputation points Microsoft Employee
    2021-03-29T02:48:06.937+00:00

    Hi @Mark TT ,

    I think this is because of a setting error of your send connector or Exchange server.
    Is the domain of your recipient configured as an authoritative accepted domain?
    See this thread: https://social.technet.microsoft.com/Forums/office/en-US/8eb458ae-42e9-4aba-a181-4ffaf627c3e8/last-error-a-local-loop-was-detected-exchange-2010-linux-postfix?forum=exchangesvrsecuremessaging

    About the error: Hop count exceeded - possible mail loop detected, please check this:
    82175-image.png

    Regards,
    Lou


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