Emails that are sent from on-premises to Microsoft 365 show email addresses not display names in From

  • Article
  • Applies to:
    Exchange Online, Exchange Server 2010 Enterprise, Exchange Server 2010 Standard

Original KB number:   2663556

Note

The Hybrid Configuration wizard that's included in the Exchange Management Console in Microsoft Exchange Server 2010 is no longer supported. Therefore, you should no longer use the old Hybrid Configuration wizard. Instead, use the Microsoft 365 Hybrid Configuration wizard that's available at https://aka.ms/HybridWizard. For more information, see Microsoft 365 Hybrid Configuration wizard for Exchange 2010.

Symptoms

After you migrate mailboxes from your on-premises environment to Microsoft 365 in a hybrid deployment, the From field of email messages that are sent from the on-premises environment to Microsoft 365 doesn't show display names. Instead, the From field shows email addresses.

Cause

This issue occurs if the hybrid deployment is set up incorrectly.

To verify that you're experiencing this issue, examine the email header of an email message that was sent from the on-premises user account. Typically, X-MS-Exchange-Organization-AuthAs should be listed as Internal. If X-MS-Exchange-Organization-AuthAs is listed as anonymous or if it's missing, this indicates an incorrect configuration or an incorrect mail route.

Resolution

To fix this issue, follow these steps:

  1. Check the mail route.

    The simplest route is Exchange 2010 mailbox server to Exchange 2010 hub server (hybrid server) to the Exchange Online Protection (EOP) inbound connector to Exchange Online. Make sure that there are no unnecessary network devices such as anti-spam gateway devices between the Exchange 2010 hub server (hybrid server) and EOP. Those devices could remove the necessary header.

  2. Check the remote domain of the on-premises Exchange server. To do this, follow these steps:

    1. In Exchange Management Shell, run the following PowerShell command:

      Get-RemoteDomain < NameOfService>.< DomainName>.com | FL

      For example:

      Get-RemoteDomain exchangedelegation.contoso.com | FL

    2. In the output, make sure that the TrustedMailOutboundEnabled, TargetDeliveryDomain, and IsInternal attributes are set to True.

    3. If the attributes in step 2b aren't set to True, use the Set-RemoteDomain command to change the value to True.

  3. Check the remote domain in Microsoft 365. To do this, follow these steps:

    1. Connect to Exchange Online by using remote PowerShell. For more info about how to do this, see Connect to Exchange Online PowerShell.

    2. Run the following PowerShell command:

      Get-RemoteDomain <FQDNOfOnPremisesEndConnector> | FL

    3. In the output, make sure that the TrustedMailnboundEnabled attribute is set to True.

    4. If the attribute in step 3C isn't set to True, use the Set-RemoteDomain command to change the value to True.

  4. Make sure that Transport Layer Security (TLS) is implemented and enabled in both environments and that the fully qualified domain name (FQDN) is set correctly. Check the on-premises send connector and the EOP inbound connector by using the Exchange Server Deployment Assistant at Exchange Deployment Assistant.

  5. Check the Exchange certificate of the send connector on the on-premises Exchange servers that are responsible for delivering mail to EOP. The Exchange certificate should have Simple Mail Transfer Protocol (SMTP) enabled and should match the FQDN of the send connector.

If the issue persists after you follow these steps, contact Microsoft 365 Support.

More information

Still need help? Go to Microsoft Community or the Exchange TechNet Forums.