<?php
$a=$_POST['a']; textbox 1 name
$b=$_POST['b']; textbox 2 email
$c=$_POST['c']; textbox 3 idea
$toaddress='roy_colman2003@yahoo.com';
$fromaddress='from:'.$b;
if (!eregi('^[a-zA-Z0-9_\-\.]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$', $b))
{
echo 'success';
exit;
}
mail($toaddress,$a,$c,$fromaddress);
?>