Mailto Does Not Attach Form Information

Attached is the code. It does open the email but does not send any information.
<!-- Table 2 for the Content -->
<form name="orders" onsubmit="return confirmSubmit()" onreset="return window.confirm('Are you sure you want to reset your Orders.'); " action="mailto:lynette@sayorkies.co.za" method="post" enctype="text/plain">

// Function to Confirm certain conditions and confirm to proceed with order
function confirmSubmit() {
var itemsOrdered = true;
if (document.forms[2].totalExcl.value == 0 || document.forms[2]delivery.value == 0) {
itemsOrdered = false;
}
if(itemsOrdered != true) {
window.alert("You have not chosen any products to purchase or No Delivery Option selected.");
return false;
}
var submitOrder = window.confirm("Are you sure you want to place the order?");
if(submitOrder == true)
return true;
return false;
}

// Function to calculate order value
function calculateValue(orders) {
var orderValue = 0; .....