cURL not working

[tableman]

A form has entries like this:

<input type="text" name="first_name" size="24" />
<input type="text" name="last_name" size="24" />

<input type="hidden" name="must_have" value="12345" />

<input type="hidden" name="recipient" value="myemail@comcast.net" />
<input type="hidden" name="redirect" value="http://mywebsite.com" />
<input type="hidden" name="subject" value="Topic In Question" />

When the action in the form is set to go directly to the receiving file like this:

<form method="post" action="http://theirwebsite/receive.jsp" name="goodname">

everything works. The entries are received by http://theirwebsite/receive.jsp.

However, I need to use a separate file to send the form entries, so the form action is set like this:

<form method="post" action="http://mywebsite/separate.php" name="goodname">

Code in http://mywebsite/separate.php is like this:

<?php 
$siteUrl="http://theirwebsite/receive.jsp/";
 $variablesToPost = array 
( 
"first_name", 
"last_name", 
"must_have", 
"recipient", 
"redirect", 
"subject" 
); 

$postData= array(); foreach($variablesToPost as $variable) 
{ 
$postData[] = $variable . '=' . htmlspecialchars($_REQUEST[$variable]); 
} 
$postData = encodeQueryString(implode('&', $postData));
 
$curl = curl_init(); 
curl_setopt($curl, CURLOPT_URL, $siteUrl); 
curl_setopt($curl, CURLOPT_POST, 1); 
curl_setopt($curl, CURLOPT_POSTFIELDS, $postData); 
curl_exec ($curl); curl_close ($curl); 
?>

All hidden fields required by the destination file are in the form and listed in the array.

Something must be wrong with the code because the values are now not received by http://theirwebsite/receive.jsp.