Joomla/Virtuemart Help

I have a Joomla 1.5.x with Virtuemart installed. I need someone to configure me virtuemart to send out a custom email message (created by me) to my customer after they checkout and payment is confirmed by PayPal. I have 3 products that each need this feature. This is exactly how it should work........ 1. Customer adds product to cart 2. Customer makes payment by PayPal 3. Customer receives an email immediately (this is what i need configured) I think virtuemart may already have this email feature built in but I'm not sure how to configure it. Please help. Funds will be escrowed.