Double the Email

[iagal]

Using php for a mailform, results in 2 email responses. No clue why that would ever happen. Might anyone have any ideas?

<?

if ($submit) {
$to ="[e-mail]";
$subject = "Request to join CCG E-mail group";
$header = "From: $contact\nReply-To: $email";
$msg = "$pre$contact\n\n";
$msg .= "$firm\n\n";
$msg .= "$address\n\n";
$msg .= "$address2\n\n";
$msg .= "$address3\n\n";
$msg .= "$phone\n\n";
$msg .= "$fax\n\n";
$msg .= "$email\n\n";
$msg .= "$maillist\n\n";
$msg .= "$emaillist\n\n";
mail ($to, $subject, $msg, $header);

echo "Thank you. Your request has been sent.";
} //end if

else {

?>

<p>If you would like to be added to the e-mail group and receive meeting notices and related materials via your e-mail mailbox, please fill out the following form completely:

<form action="ccgform.html" method="post"> 
  <center>
 <table cellpadding="2">
    <tr bgcolor="CCCCCC"><td><input TYPE="checkbox" NAME="pre" VALUE="Mr.">Mr.
                               <input TYPE="checkbox" NAME="pre" VALUE="Ms.">Ms.</td><td>&nbsp;</td></tr>
     <tr bgcolor="CCCCCC"><td>     Name: (First/Last) </td><td> <input type="text" name="contact" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     Contact Firm: </td><td> <input type="text" name="firm" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     Contact Address: </td><td> <input type="text" name="address" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     &nbsp; </td><td> <input type="text" name="address2" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     City/State/Zip: </td><td> <input type="text" name="address3" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     Contact Phone: </td><td> <input type="text" name="phone" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     Contact Fax: </td><td> <input type="text" name="fax" size="40"></td></tr>
     <tr bgcolor="CCCCCC"><td>     Contact Email: </td><td> <input type="text" name="email" size="40"></td></tr>
 </table>
 <center><table cellpadding="2" border="0">

<tr bgcolor="CCCCCC"><td><input TYPE="radio" NAME="maillist" VALUE="Mailing List Request">Add me to the Mailing List</a></td></tr>
<tr bgcolor="CCCCCC"><td><input TYPE="radio" NAME="emaillist" VALUE="E-Mail Group Request">Add me to the E-Mail Group</a></td></tr>
</table></center>
<table cellpadding="4">
<tr><td></td><td><input TYPE="Submit" name="submit" VALUE="Submit"></td><td>or <input type="reset" value="Clear Form"></td></tr>
</table>

<?

} //end else

?>