We have a group of users, say it groupA, and we would like only members of groupA to send a private message to another group, say it groupB.
In other words, groupB members should receive a private message only from members of groupA.
In our case, we have customers who have be awarded a membership to groupA from the admin, to allow them (exclusively) ask question via PM to a group of experts (groupB). We do not want groupB to receive PMs from anybody except groupA members. Think of it as a special feature only for these VIP members of groupA.
Is there a way to accomplish this?
Thanks for your wonderful software and project!