Sending mail

Hey guys,

I've run into a problem on my website. I need to send two emails when a form is processed. One is to me, one is to the person submitting the form. I've been using mail() but its performance is sketchy at best. Sometimes the email sends, sometimes is doesn't. Any suggestions on how to reliably send emails? I want to be sure I get the information I need, and they get a confirmation email.