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<?php
header('Content-Type: text/html; charset=utf-8');
// Variables
$name = trim($_POST["name"]);
$mail = trim($_POST["mail"]);




$pattern = "/(content-type|bcc:|cc:|to:)/i";

$to = 'example@example.com';
$sub = "=?utf-8?B?". base64_encode("topic of the letter"). "?="; // You can define email subject
// HTML Elements for Email Body
$body = "Name: $name<br>Email: $mail<br>";
//Must end on first column
$headers = "From: example@example.com" ."\r\n";
$headers .= "Content-type: text/html; charset=utf-8\r\n";
// PHP email sender
mail($to, $sub , $body, $headers);
?>
  
  AJAX 
  
  <script>
	$(document).ready(function() {

	//E-mail Ajax Send
	$("form.callback").submit(function() { //Change
		var th = $(this);
		$.ajax({
			type: "POST",
			url: "mail.php", //Change
			data: th.serialize()
		}).done(function() {
			alert('Success');
			
			setTimeout(function() {
				// Done Functions
				th.trigger("reset");
			}, 1000);
		});
		return false;
	});

});

</script>