Trying to do some research into an upcoming project that requires an online counselling feature. Pretty much requires a login/registration feature, user manager, file upload and online inbox. First three will be fine for C5, I'm trying to judge how I can go about the Inbox as well, if possible. Can I make an inbox so to speak that will pretty much work as an email system on the website that works through the private message feature on C5?

As well there will be permissions in terms of the counsellor only messaging his/hers users/patients, users won't be able to message other users.

Can all of this be done? Any help will be welcomed thanks!