1)   ServiceBuilder - Worship Leader Software 50408-0001
Confirmations with church musicians can be automated! Let people click a link in their email program to confirm they're presence at rehearsal or at the service.

 2)   Mailinfo 3.0
Mailinfo helps you make sure your outgoing emails are not blocked as spam. Real time alerts directly to your desktop when your outgoing email is viewed and a daily reminder to follow up on any of your emails which haven't been confirmed by Mailinfo.