Forum Discussion
Dynamic Distribution Group issue in Hybrid Exchange Setup
We finally able to solve this issue while working with Office 365 Support. It has taken a long time due to ping pong between on premises and Exchange Online teams. Anyway, after digging a while - solution turned out be an attribute issue, which solved our problem.
1. we re-run the Hybrid configuration wizard then following command was run on affected Dynamic Distribution Group.
Set-DynamicDistributionGroup DDG1@abc.com -RequireSenderAuthenticationEnabled $false
Hopefully, it may help someone out there. Thanks.
This is very likely going to be part of the problem yes. In order for email to work in a Hybrid, all mail accounts must have an alias address added in the format of;
DDG1@tenantname.mail.onmicrosoft.com
Note that I have added mail into this address. This is important. Please can you try this?
Thanks Peter, yeah i meant username@tenanatName.mail.onmicrosoft.com was missing and i have added it. After doing this i got below error for couple of test emails
"Your message can't be delivered because delivery to this address is restricted.
For more information about this issue see DSN code 5.7.1 in Exchange Online."
Then i started getting same old error
"Your message to DDG1@abc.com couldn't be delivered.
DDG1 wasn't found at abc.com"
Just for your knowledge, account that i am using is authorized to send email to that DDG group. Any other ideas please. Thanks
- Hi shai101,
We added proxy address "email address removed for privacy reasons" then used this command to mark authentication attribute to false.
Set-DynamicDistributionGroup email address removed for privacy reasons -RequireSenderAuthenticationEnabled $false
Hope, this helps. Hey
So eventuallly you didnt need to add proxy address of @tenant.mail.onmicrosoft.com to the dynamic group?
We finally able to solve this issue while working with Office 365 Support. It has taken a long time due to ping pong between on premises and Exchange Online teams. Anyway, after digging a while - solution turned out be an attribute issue, which solved our problem.
1. we re-run the Hybrid configuration wizard then following command was run on affected Dynamic Distribution Group.
Set-DynamicDistributionGroup DDG1@abc.com -RequireSenderAuthenticationEnabled $false
Hopefully, it may help someone out there. Thanks.
Thank you, yes please do post here again if you get the solution from Microsoft. Good luck.
Thanks Peter. Well, I will do that and will post the solution. Thanks for your all support.
Running out of ideas now. Did you try changing the accepted domain in Exchange Online to Internal Relay as the original document you posted suggested?
Short of this, I would suggest opening a ticket with Microsoft support as your next logical step.