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Sree20212021 asked JoyZhang-MSFT edited

New concern

,In the hybrid exchange setup, for the account created on Online, how to create a email mapping in the onpremise server. ? it will be almost same as the remote mailbox contact in the exchange, but actually the account not exiting in the on-prem AD
Tags: office-exchange-online-itpro,office-exchange-server-connectivity,office-exchange-server-mailflow

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Hi @JustinMicheal-7973 ,

Is there any updates?

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JoyZhang-MSFT answered JoyZhang-MSFT edited

Hi @JustinMicheal-7973 ,

Based on the explanation of Enable-RemoteMailbox , we use the Enable-RemoteMailbox cmdlet to create a mailbox in the cloud-based service for an existing user in the on-premises Active Directory.

I'm curious about why you want to create a account in exchange online then create a "Remote" mailbox in on premise ? Why not create a exchange online mailbox directly?

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We have centralized mail routing..
After creating exchange online mailbox over there, how Exchange onprem will understand about the new object created in the Online

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Hi @JustinMicheal-7973 ,

When centralized mail transport is enabled, incoming Internet messages are routed as follows in a hybrid deployment:

  • An inbound message is sent from an Internet sender to the recipients who are located in Exchange Online.

  • Because the exchange online recipients have (on-premise) email addresses, and the MX record for points to EOP, the message is delivered to EOP and scanned for viruses.

  • Since centralized mail transport is enabled, EOP routes the messages for exchange online recipients to an on-premises Exchange server.

  • The on-premises Exchange server performs a lookup for exchange online recipients and determine the exchange online recipients are located in the Exchange Online organization.

  • The on-premises exchange server sent mails back to EOP.

  • EOP sends the message to Exchange Online.

  • Exchange Online delivers the message to recipients' mailboxes.

For more details: centralized mail routing

You don' t need to configure anything since all transport settings are automatically configured in your on-premises organization and in the EOP company included in your Exchange Online organization when you run HCW.

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The user is already created in o365. I have created in onprem AD.

Do I need to create the user in onprem AD before issuing the command

Or no need on such a user in onprem AD.. ?

Enable-RemoteMailbox “user identity” -RemoteRoutingAddress “
run the below command to get the Exchange Online GUID of the cloud mailbox

Can you help me with commandlets in detail please

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