How to configure dynamic mail group on the hybrid exchange deployment

[Sukhee455]

Hello,

We have on premises exhchange server 2016 and recently we migrated some mailboxes to the cloud M365,
But now we can't send a mail to all users.
How to configure dynamic distribution mail and how to send a mail all users (both of on premises and online)

[#2]

Dynamic DGs are not synced to M365, thus they do not represent a valid recipient object. Consider recreating them in Exchange Online.

[#3]

@Vasil MichevThank you for your information, We made a create new dynamic DG but only online exchange users received email. how to sent emails to on premises users ?
ps: our some users migrated online and some users still in on premises exchange server.

[#4]

Hope the following article will help you
https://docs.microsoft.com/en-us/exchange/troubleshoot/groups-and-distribution-lists/dynamic-distrib...

Mailboxes that are migrated to Microsoft 365 become mail-enabled users in the on-premises directory.

Resolution
Use the Set-DynamicDistributionGroup cmdlet to update the filters for the dynamic distribution group to include mail-enabled users.

[#5]

Hello @EdTheFil ,  

Thank you for your reply, and i have another on question :D
- We followed that steps and configured but we can't appear accept or reject button
I attached screen shot

BR,

Sukhee455

[#6]

We do not use this function, but what about opening the Outlook element attached?
That would be logical, as you cannot make the decision without viewing the message itself.