Unable to send email to distribution group "you dont have permssion" Exchange Hybrid setup.

ATFRMZ 41 Reputation points
2023-04-10T12:01:46.23+00:00

Hi, I am trying to add exchange online user to deligation tab on onprem exchange distributoin group properties but I cannot find the user exchange online user. I am trying to give access to a user who is exchange online user to be allowed to send email to our onprem email distribution group. Please help!

Microsoft Exchange Online
Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
1,099 questions
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
1,906 questions
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4 answers

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  1. Andy David - MVP 142.6K Reputation points MVP
    2023-04-10T12:04:44.6933333+00:00

    Is there a remote mailbox on-prem that represents the Exchange Online user? If not, create it: https://blog.expta.com/2016/05/creating-remote-mailbox-in-exchange.html


  2. Aholic Liang-MSFT 13,821 Reputation points Microsoft Vendor
    2023-04-18T10:19:38.9266667+00:00

      Hi @ ATFRMZ , Are you referring to granting users in Exchange online Full Access and Send As permissions in an on-premises distribution group?

    In a hybrid environment, Microsoft 365 or Office 365  mailboxes can be granted full access and send on behalf  permission to on-premises shared mailboxes**.**

    I recommend that you could refer to the following command line to see if you can add it:

    Add-MailboxPermission -Identity <MailboxIdentity> -User <DelegateIdentity> -AccessRights FullAccess -InheritanceType All [-AutoMapping $false]
    
    Set-Mailbox -Identity seanc@contoso.com -GrantSendOnBehalfTo hollyh
    

       

    For permissions in the hybrid environment, please refer to this link: Permissions in Exchange hybrid deployments | Microsoft Learn

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  3. ATFRMZ 41 Reputation points
    2023-04-20T10:22:51.19+00:00

    I was able to add EXOmailbox user to On-Prem Distribution group under Delivery management and there after EXOmailbox user was able to send mail to this distribution group. User's image

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  4. Aholic Liang-MSFT 13,821 Reputation points Microsoft Vendor
    2023-04-21T08:45:15.7833333+00:00

     Hi @ ATFRMZ

    Sorry for the misunderstanding of this issue above. Here are some other suggestions I have for this issue:

    Please run this command on-prem to check if the remote mailbox exists:

    Get-RemoteMailbox -Identity user@contoso.com | Format-List
    

    If so, try referring to this command to add it in delivery management to see if it works:

    Set-DistributionGroup  -IgnoreNamingPolicy "True" -Identity "dg1" -AcceptMessagesOnlyFromSendersOrMembers ("user1")  -RequireSenderAuthenticationEnabled "False"
    

     


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