$mesaj icindeki html silebilirsin orasi sana kalmis.

$kime = ''kime@domain.com'';
$konu = ''konu yaz buraya'';
$text = "Mesaji buraya yaz";
$mesaj = '
<html>
<head>
  <title>email</title>
</head>
<body>
  <p>Cevap:</p>
  <table>
  <tr><th>'.$otg.'</th></tr>
  </table><br>
 <p> 
  Saygilar</p> <p> 
dwfgare
  </p>

</table>
</body>
</html>
';


$header  = 'MIME-Version: 1.0' . "\r\n";
$header .= 'Content-type: text/html; charset=UTF-8' . "\r\n";
$header .= 'To: '.$kime.'' . "\r\n";
$header .= 'From: <support@domain.com>' . "\r\n";

mail($kime, $konu, $mesaj, $header);
$sonuc = "Gonderildi !";
}
?>