Trc4 sorry for the late reply. I will cleanup all inactive forums, since I suspect that it is due to high load during peak hours.
Henrie there is no mass mailing extension yet, but there are some existing extension requests at GitHub. You may upvote them to show your interest, for example: https://github.com/FreeFlarum/freeflarum.com/issues/308. If you have an existing specific extension in mind and it's not yet requested, then please create a new issue.
FreeFlarum is currently updating all forums to the latest Flarum release. All forum databases are being migrated. If you see a prompt for database password, please fixup your forum here: https://freeflarum.com/settings/forum_settings or wait a few hours.