Hi,
If I understand you correctly ...
<?php
$result = mysql_query("
SELECT *
FROM `privatemail`
WHERE `to` = '".$id."'
AND `new` = 'new!'
");
$num_rows = mysql_num_rows($result);
?>
... or ...
<?php
$result = mysql_query("
SELECT COUNT(*)
FROM `privatemail`
WHERE `to` = '".$id."'
AND `new` = 'new!'
");
$num_rows = mysql_result($result, 0, 0);
?>
P.