I did some quick testing, attempting to get the value passed from the drop down box to printing to the screen... setting
$recipient = $_POST['send'];
allows that to be done. Your dropdown box has the name send therefore php creates the variable $_POST['send'] ueing this you can pass the value to you script.
As it is now if the user does not select any recipient the default will be the first one in the drop down... a work around for that is to put something like this
<SELECT name="send" size="1" type="select">
<OPTION value =""> ---- </OPTION>
<OPTION value ="jp"> JP</OPTION>
<OPTION value ="cmyk">CMYK</OPTION>
<OPTION value ="gloria">Gloria</OPTION>
<OPTION value ="print">Print</OPTION>
</SELECT>
This will make the default null, then a simple check like;
if($recipient == ""){ die("you must select a recipient" }
Hope that is of soem help...