MyBB Community Forums

I can't find it and it seems like it should be there but how do you do mass mailings to specific usergroups?

forum administrator can send group mails through forum admin panel.
see related guidance here => mass mail

MyBB uses tasks system to send mass mails. it might be better to disable
it and use cron job at the server level [if server has the cron facility]
[see related post]