It works great. Thank you!
I tested it out but after a while my server still timed out. There was another Mass Messaging plug in I found before yours and it worked by sending batches of 100 at a time. 100 of 2500, 200 of 2500, 300 of 2500 etc. Maybe you could implement something like that.
If it could trigger an auto email to each member alerting them they have received a private message would be great too.
I never did get it working but I did find a new plugin called Mass Messaging for BuddyPress – by Alkaweb which is new. I’m not sure if it’s the same developer. It works but it needs some more features to be perfect.