PHP
$header = "From: ".$afzendernaam."<".$emailadres.">\r\n";
$header .= "Reply-To: ".$_POST['mailadres']."\r\n";
$header .= "MIME-Version: 1.0\r\n";
$header .= "Content-Type: text/html; charset=iso-8859-1\r\n";
$header .= "X-Priority: 3\r\n";
$header .= "X-MSMail-Priority: Normal\r\n";
$header .= "X-Mailer: PHP / ".phpversion()."\r\n";
zoiets!!