Forum Discussion
Group Email by Domain Users
Either Dynamic DG or O365 Group would do, the problem is that *everyone* can send messages to it once you toggle the flag. To restrict this, the best option would be to use Mail flow rules, as they give you a lot of freedom in terms of conditions you can use to "match" the sender.
Based on your original question, I thought you *didnt* want external messages to the group? If you do want to enable this, toggle the RequireSenderAuthenticationEnabled flag. If you want to only allow messages from specific external addresses, best create a Mail flow rule.
VasilMichev Appreciate the help. Some of your questioning led me to look into some items further.
What I have is several "external" systems that I want to be able to email distribution lists/groups. Those systems do not authenticate but rather send via SendGrid.
For now I think I have it accomplishing what I wanted by allowing "external" senders, but then creating a dynamic distribution list with all users/groups and then it has allowed the message to be sent.
I'm not sure if this is the best way to accomplish this or not, but for now, it seems to be working.
Either Dynamic DG or O365 Group would do, the problem is that *everyone* can send messages to it once you toggle the flag. To restrict this, the best option would be to use Mail flow rules, as they give you a lot of freedom in terms of conditions you can use to "match" the sender.
