Simple mail handler

I want to be able to capture names and emails from my sites via a form. Then i want to send out emails on a timed basis and when ever i feel like it. I want to be able to turn on and off the sign-up confirmation email at my leisure so i can send emails to individuals that have not yet confirmed their sign-up. I have a server where i can plug in the script of the database via mysql and php. I require complete confidentiality of my sites and projects.