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.





