title: How to validate an email address with php?
body: <p>I started trying to write a php script to validate the email address that the user enters in my form.
  Can anybody please help me to finish it? Thanks in advance. Your help will be greatly appreciated :)
  NOTE: Please do not tell me to use javascript or jQuery. I need to do this with php :/</p>
  
  <pre><code>&lt;?php
  $mail = $_POST['mail'];
  $formcontent = "Email: $mail";
  $recipient = "email@example.com";
  $subject = "Mail that uploaded picture";
  $mailheader = "From: my website";
  
  if ($mail == ""){
  echo "Please enter a valid email address. We want to contact you using your email address. Do not worry, nobody will be able to see it.";
  }
  
  else{
  mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");
  echo 'Your email address has been successfully added to your photo !&lt;br&gt;We will contact you later to tell you how to win the $50 000 :)&lt;br&gt;&lt;br&gt;';}
  
  ?&gt;
  </code></pre>