"550 5.1.10 RESOLVER.ADR.RecipientNotFound" NDR error message when an Office 365 user tries to send mail to on-premises users in a hybrid deployment
An Office 365 user is unable to send email messages to on-premises Exchange users in an Exchange hybrid deployment. The Office 365 user receives the following nondelivery report (NDR):
Your message to User@contoso.com couldn't be delivered.
User wasn't found at contoso.com
The NDR contains the following error code:
550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup
This occurs if the user was created in Office 365. In this scenario, the on-premises Exchange environment has no object to reference for the user. Therefore, all queries for that SMTP address fail.
Create a remote mailbox in the on-premises environment and then wait for or force directory synchronization to occur. To do this, follow these steps:
- Create an on-premises object for the cloud mailbox by using the New-RemoteMailbox cmdlet in the Exchange Management Shell.
Note This object must have the same name, alias, and user principal name (UPN) as the cloud mailbox.
For more information, see New-RemoteMailbox.
- Set the ExchangeGuid property on the new on-premises object that you created in step 1 to match the cloud mailbox. To do this, follow these steps:
- Connect to Exchange Online by using a remote PowerShell.
For more information about how to do this, see Connect to Exchange Online PowerShell.
- Use the Get-Mailbox cmdlet to retrieve the value of the ExchangeGuid property of the cloud mailbox. For example, run the following command:
For more information, see Get-Mailbox
Get-Mailbox <MailboxName> | FL ExchangeGuid
- Open the Exchange Management Shell on the on-premises Exchange server.
- Use the Set-RemoteMailbox cmdlet to set the value of the ExchangeGuid property on the on-premises object to the value that you retrieved in step 2b. For example, run the following command:
For more information, see Set-RemoteMailbox.
Set-RemoteMailbox <MailboxName> -ExchangeGuid <GUID>
- Wait for directory synchronization to occur. Or, force directory synchronization.
For more information, see Synchronize your directories.
- Make sure that the Office 365 user object is displayed as "Synced with Active Directory."
Artikel-id: 3197393 – senaste granskning 10/07/2016 21:38:00 – revision: 1.0
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