I have a Distribution Group setup in Exchange 2013, let's call it Group1. It is set so that only members of the group can send emails to the group, plus our three IT administrators. Thus, the group members receive emails on the list and can send, while our IT admins can send to the list if needed, but don't receive messages from the list.
To accomplish this, I went in ECP and went to Recipients -> Groups -> Edit Distribution Group in question -> Delivery Management. Here I added Group1 as an authorized sender (so that, by default, all group members can send to the group) and then added the names of our IT staff.
What I would like to know is if it's possible to add a security group as authorized senders? Such as Domain Admins, or a security group I create myself. It would be cleaner to be able to specify an administrator group so that as staffing changes, I can just change group membership instead of editing the authorized senders for all our distribution groups.