title: header function mail() php
body: <p>i have to send mail with function mail() of PHP.
  I have to insert Reply-To header but it not work:</p>
  
  <pre><code>&lt;?php
      $body = "&lt;html&gt;\n";
      $body .= "&lt;body style=\"font-family:Verdana, Verdana, Geneva, sans-serif; font-size:12px; color:#666666;\"&gt;\n";
      $body = $message;
      $body .= "&lt;/body&gt;\n";
      $body .= "&lt;/html&gt;\n";
  
      $headers  = "From: My site&lt;noreply@example.com&gt;\r\n";
      $headers .= "Reply-To: info@example.com\r\n";
      $headers .= "Return-Path: info@example.com\r\n";
      $headers .= "X-Mailer: Drupal\n";
      $headers .= 'MIME-Version: 1.0' . "\n";
      $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
  
      return mail($recipient, $subject, $message, $headers); ?&gt;
  </code></pre>
  
  <p>In this example of php.net there is $headers .= "Reply-To: info@example.com\r\n"; but if copy and paste this and then send mail the Reply-To header there is not. If insert other header like From, CC, Bcc these there are correctly in my HTML mail, only Reply-To header there is not.
  I have try like "Reply-to", "Reply to", "Reply To", "Reply" etc but it not work.
  I have use Php 5.4 can help me? </p>