I have a small RT installation started that I'm using to simplify my life working with different groups of users, and presently I create all the tickets and add the person who's requesting them as a CC to each one.
I realized that I could simply have them email a 'ticket create' address because rt-mailgate can create a new ticket when it receives email. This works brilliantly for myself, because my email address is in the RT system, but email@example.com, say, can't email that address (firstname.lastname@example.org) and get a ticket created. The emails appear to be silently ignored if RT doesn't know about the user. I could add each person's email by hand, but then if a new person is added at that site, they will not be able to submit tickets until I add their email.
Is there a kosher way to do this? I have found plenty online about how to setup rt-mailgate and I have it working, and I can email back and forth with it all day. If my users could as well, that will ease some of my pain considerably.
I do realize RT is overkill for a one-or-two man installation, but it is the best tool I've been able to find and I'm expecting to grow. :)