That’s an option but I’d rather do it inside the forum if possible.
I used @trust_level_2 for example (not many members in that - about 500) and this emailed everybody. So I thought if I add people to a group of the same size and PM them they’d get an email.
I’ve just tried with a small group of 70 users and that didn’t send an email either so it’s not size related I don’t think.