Allow messages from outside organization not allowed while creating email group/ DL

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3 answers

  1. Vergil-V 14,765 Reputation points • Microsoft External Staff • Moderator

    Hi Bhattacharya, Paramita 

    In my testing within an Exchange Online environment, I am still able to update the delivery management setting for a distribution group to "Allow messages from people inside and outside my organization".

    May I kindly clarify whether this distribution group is hosted on-premises and then synchronized to the cloud? 

    If that is the case, you may need to update the group directly in your on-premises environment and then allow Microsoft Entra Connect to complete the synchronization. 

    You may also try using the following PowerShell command: 

    Set-DistributionGroup -Identity "group+domain.com" -RequireSenderAuthenticationEnabled $false 

    You can run this by connecting to the Exchange Online module if the group is managed in Exchange Online, or through the Exchange Management Shell if it is managed on-premises. 

    Additionally, may I kindly check whether this behavior also occurs with a newly created distribution group? 

    If you have any updates after reviewing this, please feel free to share them with me. 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

    1. Vergil-V 14,765 Reputation points • Microsoft External Staff • Moderator

      Hi Bhattacharya, Paramita
      I just wanted to kindly follow up to see if you’ve had a chance to review my previous response.

      I would greatly appreciate any updates you may be able to provide.

      Thank you again for your time, and I look forward to hearing from you.

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  2. Bhattacharya, Paramita 0 Reputation points

    it is showing server busy while selecting allow external message option.

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  3. AI answer

    To allow messages from outside the organization to a distribution group or Microsoft 365 group, configure the group’s delivery settings in the admin tools rather than at creation time.

    For a Microsoft 365 group (including SharePoint-connected groups):

    1. In the Microsoft 365 admin center, go to Teams & groups > Active teams & groups.
    2. Select the group.
    3. On the Settings tab, enable Let people outside the organization to email this group (or Allow external senders to email this group depending on the UI).
    4. Save the change and wait up to about an hour for it to take effect.

    Alternatively, in the Exchange admin center for Microsoft 365 groups:

    1. Go to Recipients > Groups and select the group.
    2. Open Settings.
    3. Under delivery options, select Allow external senders to email this group and save.

    For classic distribution lists in Exchange Online:

    1. In the Exchange admin center, go to Recipients > Groups and select the distribution list.
    2. Under Delivery management, choose Senders inside and outside of my organization to allow Internet senders.
    3. Optionally, use Specified senders if only certain senders should be allowed.

    If external senders still receive NDRs such as 5.7.193, 5.7.133, or 5.7.124, verify that:

    • The group is configured to allow external senders as above, and
    • The sender is either in the allowed senders list (if restrictions are configured) or the group is set to allow all internal and external senders.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.
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