title: phpmailer - How to verify a sent email arrived at its destination
body: <p>phpmailer is working fine and able to use it in various ways, but.... I'm trying to find a way to determine if a valid looking email address actually made it to some destination. I am <strong>NOT</strong> talking about validating addresses such as...<br> 
  <code>if (!$mail->validateAddress($email)) {echo 'Not a valid squiloople email pattern';}</code><br><br>
  This is my setup is using SMTP through gmail...<br></p>
  
  <pre><code>$mail-&gt;isSMTP();                        
  $mail-&gt;SMTPAuth = true; 
  $mail-&gt;SMTPDebug = 0;                   
  $mail-&gt;isHTML(true);
  $mail-&gt;Host = 'smtp.gmail.com';         
  $mail-&gt;Username = "XXXl@gmail.com";  
  $mail-&gt;Password = "XXX";    
  $mail-&gt;SMTPSecure = 'ssl';              
  $mail-&gt;Port = 465;                  
  </code></pre>
  
  <p>If the email address looks like a duck and quacks like a duck then...<br>
  <code>$result = $mail->send();</code> Will <strong>Always</strong> return true!<br>
  <code>var_dump($mail->send());  // Also returns Boolean </code><br><br>
  Is there a way to test if the email was actually received somewhere? Or is this strictly a one-way shout-out through google's SMTP gmail servers??? <br><br>
  Any tips, tricks, or pointers would be appreciated.  </p>