title: How to count website contact form submissions without database
body: <p>Hi I'm new here and have a question about SMTP mail PHP function.
  I created a contact form which sends an HTML email to the company.</p>
  
  <p>Now I've been asked to create a counter for every email sent from the web page, so they can know how many people are requesting information about the product. I read that is not possible without a database, which we're not using for this project, but I was thinking about doing it with an XML counter.</p>
  
  <p>Is this the better way, or there's other possibilities for this?</p>