For everyone looking for a way to host forums, given the current state of tech, I’d suggest trying out Discourse. www.discourse.org (I especially appreciate the email options)
If you need more advanced collaborative features, Mattermost might cater to your needs.
mattermost.com
Discourse is the place to build civilized communities
-> cont’d. Also note that there is a mobile app for Discourse if you want easy access to one or many forums based on the Discourse platform.
iOS app: itunes.apple.com/us/app/disco...
Android app: play.google.com/store/apps/d...