<?php
$to  = 'cesar@example.com'; // Email destination
$subject = 'Asunto aquí';

$message = '
<h1>Html Test</h1>
<br>
hola mundo
';
$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'To: Cesar <cesar@example.com>, Kelly <kelly@example.com>' . "\r\n";
$headers .= 'From: You <hack@example.com>' . "\r\n";
//$headers .= 'Cc: cc@example.com' . "\r\n";
//$headers .= 'Bcc: cc@example.com' . "\r\n";
mail($to, $subject, $message, $headers);
?>