It is worth it to send a e-mail to see if it goes through if they have one.It is no extra effort on your part to send everyone a group mail,so do it.
I bought a gift certificate of $50 and sent each one $2 with a expiration of ten days.This
produced 3 new workers.I kept track where I left off.The money comes back if not used.
Once you are through this older list,do it each month with your inactive that just joined recently.
