What's the differents between DG and SG?

Hello Star_Lord,

Hope you are doing good.

Since we haven't seen you for a while, can we know if you had referred to the reply from Anna?

Feel free to let us know if those information helpful for you or not. To be honest, if you need further help, please let us know at your convenience.

Have a nice time.

Regards,

Rudy

Hello Star_Lord,

Distribution Group is mainly for distributing emails, while SG is mainly for assign permissions.

For Transport rule in EAC, if your main concern is to control mail distributing, I think DG is fine:

Create and manage distribution groups

Manage mail-enabled security groups

I personally don’t suggest you use Office 365 group for transport rule, for you’ll find that you can’t add Office 365 groups to some conditions in a transport rule.

If you have additional requirements, then you could also upgrade current DG to Office 365 group, or create Office 365 group directly:  Why you should upgrade your distribution lists to groups in Outlook.

Here’s more details about transport rule with some specific templates you can refer to: Mail flow rules (transport rules) in Exchange Online.

To delete Office 365 group, if group owner is end-user, he or she can delete it in Outlook desktop app as well as Outlook web app: Delete a group in Outlook. Admins can remove group directly in either Exchange admincenteror Office 365 admin center.

Above methods can soft deleted a group, admins can restore it within 30 days. If you want to permanently remove group, kindly refer to this article: Permanently delete an Office 365 group.

If you have any concern, feel free to let me know.

Kind Regards,

Anna