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EavenHuang asked joyceshen-MSFT commented

group email exists but not found when sending emails

Dear experts,

We have a group named lm@domain.cn which was created in our on-premises, I don't know what I've missed, but when users tried to send to this group email address, it returned error saying it doesn't exist in our domain. Any idea how this was controlled so we can better handle it?

I remembered there was working mechanism that only some authorized users can send emails to some specific groups, not sure if that's related?

Thanks.

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office-exchange-server-administration
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Hi @EavenHuang

Any further information about your question so far?

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joyceshen-MSFT answered joyceshen-MSFT commented

Hi @EavenHuang-0590

According to your information above, are you having a hrbrid environment and you create a Mail-enabled security group on-prem and synced it to cloud. Please correct me if I have any misunderstanding about your question.

Could you please verify do all the users failed sending message to this group, no matter they inside or outside your group? By default, only people inside your organization can send message to this group. You can also allow people outside the organization to send to this group. If only users outside your organization failed to send the messages, we could edit the Delivery management. In EAC > Recipient > Groups > Mail-enabled security > your group > Settings > Edit delivery management

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If the issue occurs for all users, even include the owner of the group, please check the NDR information you received, you could share the detailed information here (note to clear your personal information)

I used to see the NDR like "5.7.54 SMTP; Unable to relay recipient in non-accepted domain”, which intended that the receive connector will not allow an anonymous, unauthenticated sender to relay to external domain names. Two ways to solve such kind of issue, one is creating an anonymous SMTP relay connector, another is using authentication for SMTP connections. Here is an article for your reference as well: How to Configure Exchange Server 2016 for SMTP Application Relay

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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Hi @joyceshen-MSFT,

Thanks for helping. We are using hybrid environment and when I tried to locate the delivery management option, it was not there. One thing that has been sorted out is - it turns out to be an incorrect group email address, it should have been lm instead of im, someone put it wrong:(

Any idea how I can verify the email flows? The aim is that only some members within our domain can send emails to this specific group email address.

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Hi @EavenHuang-0590

Thanks for providing the information. Since the group is synced from on-prem, we should manage the group on-prem as well, sorry for my mistake above.

For the mailflow in your organization, we could use Get-MessageTrackingLog (on-prem side) and Get-MessageTrace (cloud side) to search for message delivery information in our environment. In addition, can mails be delived successfully to the group when entering the right email address(lm rather then im)?

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EavenHuang answered joyceshen-MSFT commented

Hi @joyceshen-MSFT,

The mails can be delivered successfully with the correct group email address, so that issue was solved now.

I couldn't use the commands you mentioned, that requires installing additional software or something?

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Hi @EavenHuang-0590

For on-prem, we could run the command using EMS(Exchange Management Shell) or Connect to Exchange servers using remote PowerShell

For online, Connect to Exchange Online PowerShell

And make sure you have right permission to run the command list below:
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