Store custom invitation requests and send from local email address

TomMurray

 It would be great to be able to store a pre-generated invitation requests already filled out with custom invitation text and have the option to allow an administer to use his or her email address as the sender rather than ArcGIS Notifications.  Sometimes our exchange system routes all of the ArcGIS Notification emails to our junk inboxes or rejects them altogether causing the valid address to be blacklisted by Amazon.

The custom text would allow us to include contextual information on why a person is being invited and/or the groups they will participate in.  Currently, we often send pre-invitation emails describing the future invitation they will recieve.