Not Receving Non-Delivery Report In Hybrid Environment

Admin Parker 6 Reputation points

Hi M365 Experts
My organization is running with an Exchange Hybrid environment.
I'm getting an issue when sending an email (with recipient type UserMailbox) to outside the organization [ example@Stuff .com (this email does not exist)].
Immediately I received a non-delivery report email from M365. This is reasonable.
But when I sent an email (with recipient type Mail-enable security group with Send As permission) to outside the organization (and also that email does not exist). I did not receive any non-delivery report email response from M365. Anyone help me, I appreciate that. Thanks in advance!

I already tried to change the parameter of ReportToManagerEnabled was True and ReportToOriginatorEnabled was False. After sent again and checked the Message trace.


It's notified that already a NDR message was sent to that distribution but when I check that group did not have any NDRs.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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2 answers

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  1. !Daniel Bradley 1,051 Reputation points MVP

    Hi @Admin Parker

    From investigating, it looks like NDRs sent to groups, where the original email was sent with Send As permissions are automatically suppressed and cannot be worked around.

    The solution looks to be to use Send on behalf of permissions instead. Otherwise you 'COULD' convert the mail-enabled group to a Shared Mailbox and re-engineer another mail-enabled group for the purposes it was created for (or the other way round).

    I hope that helps!


  2. KyleXu-MSFT 26,241 Reputation points

    @Admin Parker

    This is an expected behavior, because the NDR message isn't supported be sent to a group. It is same to NDR send from external or internal recipient.

    Here is detailed information about it, the NDR sent to this group will be dropped with Exchange server:

    By the way, the ReportToManagerEnabled and ReportToOriginatorEnabled are used to control the NDR generated by group rather than received by group.

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