require_once "Mail.php";
  require_once "Mail/mime.php";

  $message = new Mail_mime();
  $html = "Hello <strong>world</strong> !";
  
  $message->setHTMLBody($html);
  $body = $message->get();
  $extraheaders = array("From"=>"Votre nom <votre@gmail.com>",
    "Subject"=>"Sujet du mail",
    "To"=>"Nom destinataire <destinataire@exemple.com>");
  $headers = $message->headers($extraheaders);
  
  $host = "ssl://smtp.gmail.com";
  $port = "465";
  $username = "votre_login_gmail";
  $password = "votre_password_gmail";
  
  $smtp = Mail::factory('smtp',
    array ('host' => $host,
      'port' => $port,
      'auth' => true,
      'username' => $username,
      'password' => $password));
  
  $mail = $smtp->send("destinataire@exemple.com", $headers, $body);