Google Apps sign-in
Ability to use Google Apps SSO with ability to restrict account creation to a list of domains, similar to email-based sign-on.
Single-sign-on to Google’s proprietary SaaS service now available in commercial Enterprise Edition: https://docs.mattermost.com/deployment/sso-google.html
Dan Q commented
Implemented for the web interface, but not the (Android) mobile app. See suggestion https://mattermost.uservoice.com/forums/306457-general/suggestions/37297720-support-google-apps-sign-in-when-using-the-android