title: PHP mail() - How to set Priority?
body: <p>Is there any way to set the priority of PHP mail()? I looked at the online manual but I can't find any reference to it.</p>
  
  <p>By priority, I mean High, Normal, Low or 1, 2, 3 in the headers. So the recipient knows the urgency of the mail.</p>
  
  <p>Thank you!</p>