ผม submit form ในหน้าเดียวตามคำแนะนำพี่วิน อยากจะเพิ่มการส่งเมลเข้าไปอีกแก้ยังไงครับ

<?
if($_GET["Action"] == "Progress")
{
	if(!$_POST["kanji"] )
	{
		echo "<font color=red>Insert your kanji name!</font><br>";
	}
	if(!$_POST["read"] )
	{
		echo "<font color=red>Insert your name!</font><br>";
	}
	if(!$_POST["zipcode"] )
	{
		echo "<font color=red>Insert your zipcode!</font><br>";
	}
	if(!$_POST["state"] )
	{
		echo "<font color=red>Choose your state!</font><br>";
	}
	if(!$_POST["address"] )
	{
		echo "<font color=red>Insert your address!</font><br>";
	}
	if(!$_POST["tel1"] )
	{
		echo "<font color=red>Insert your telephone!</font><br>";
	}
	if(!$_POST["email"] )
	{
		echo "<font color=red>Insert your email!</font><br>";
	}
	elseif(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL))
	{
		echo "<font color=red>Email wrong format!</font><br>";
		}
	if(!$_POST['service']) 
	{
		echo "<font color=red>Choose your service!</font><br>";
	}
}
?>