HTML Code:
<html>
<body>
<form action="multiEmail.php" method="post">
<select name="to">
<option value="a@a.com">a@a.com</option>
<option value="b@b.com">b@b.com</option>
<option value="c@c.om">c@c.com</option>
<option value="d@d.com">d@d.com</option>
</select>
<input name="Submit" type="submit" value="Submit" />
</form>
</body>
</html>
PHP Code:
<?
$to = $_POST['to'];
echo $to;
?>
Live example of above code.

Chad,
That is so beautifully simple! I’ve implemented it, with a few changes to adapt it to my form, and it seems to be working.
You’re a genius. And a gent!
Thank you