title: Automaticly send email after Paypal transaction
body: <p>I need help on making a digital delivery system for my website.</p>
  
  <ul>
  <li>Buyer clicks a paypal buy now button</li>
  <li>Buyer completes paypal transaction</li>
  <li>Buyer is redirected to a page on my website, and an email is sent to their paypal email address from me.</li>
  </ul>
  
  <p>How should I go about doing this any info would be very helpful.</p>
  
  <p>Thank you</p>