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KyleXu-MSFT avatar image
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KyleXu-MSFT asked KyleXu-MSFT commented

[Migrated from MSDN Exchange Dev] Edge server support in hybrid deployment with centralized mail flow

Hello Everyone,

Is the edge server supported supported in a hybrid deployment with centralized mail flow? Yes or No?

I Have configured edge server and bellow is the mail flow status

Mail from On-prem mailbox to on cloud mailbox: Success
Mail from On-Cloud to On-Prem: Success
Mail from external recipient to on cloud: Success
Mail from on cloud to external recipient: Fail
For the last scenario my edge server is rejecting internet bound messages from EOP with the error 550.5.7.4 unable to relay recipient in non-accepted domain.

I then gave the ms-Exch-SMTP-Accept-Any-Recipient extended rights on the edge server receive connector. This time the mails went trough EOP but then got stuck on the edge server where now I am receiving the error A matching connector cannot be found to route the external recipient.

I even changed the domain to * in the edge sync connector but after doing so all the emails in queue got flushed with an NDR message, interestingly those NDR's were not delivered to the cloud user where the mail had originated from

Source link: https://social.msdn.microsoft.com/Forums/office/en-US/b14b2184-9ff7-4821-a9eb-eeeff5c3930b/edge-server-support-in-hybrid-deployment-with-centralized-mail-flow?forum=exchangesvrdevelopment
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KyleXu-MSFT avatar image
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KyleXu-MSFT answered

The Edge server is supported to used in hybrid, but it's function is used to sent emails between the on-premises and Exchange Online organizations:
34187-qa-kyle-1022132137.png

For more detail information about it, you can have a look about this article: Edge Transport servers with hybrid deployments
So, if you want to send emails from Exchange online mailbox to external mailboxes, you may need to send to the external mailboxes directly. Rather than go through Edge server.


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ShoaibHasan-5826 answered KyleXu-MSFT commented

Thank you very much...that answers my question

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Glad to see it helps to you, I will mark it as an answer to help other forum users.

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