Many forums work the way that you can interact with it using only e-mails. We have a large group of knowledgeable people in our Services department that thinks it is inconvenient to log in to Confluence each time they have a question. Also, when they get questions in their inbox they would like the ability to give their answer just by replying to the e-mail.
This opens up a discussion on whether it is allowable to have anonymous users contributing to Questions, and even collecting expertise points (!), unless there is a way to identify the valid user through looking up the from-address in Crowd user list details.
Would like to get some information on whether this has been evaluated by Atlassian, like you are considering allowing comments on pages through e-mails.
Thanks!