It would be really useful to allow administrators to email users of an Organizational AGOL instance. We had an internal issue recently that was blocking AGOL Apps and Services. It would be really handy to email the entire user base. Some additional features such as emailing specific roles, groups, etc would also be useful. I saw past responses to this question stating that AGOL doesn't have a mail server but it has to now because it sends emails for account requests.
At a minimum there should be a way to download a CSV, table, something of users and their attributes. It would then be easy as well to access emails.