Enviar email com PHP - Não funciona

<?php
	header('Content-type: application/json');
	$status = array(
		'type'=>'success',
		'message'=>'Mensagem Enviada com Sucesso!!'
	);

    $name = @trim(($_POST['name']));
    $email = @trim(stripslashes($_POST['email']));
    $subject = @trim(stripslashes($_POST['subject']));
    $message = @trim(stripslashes($_POST['message']));

    $email_from = $email;
    $email_to = 'kirdousame@hotmail.com';

    $body = 'Name: ' . $name . "\n\n" . 'Email: ' . $email . "\n\n" . 'Subject: ' . $subject . "\n\n" . 'Message: ' . $message;

    $success = @mail($email_to, $subject, $body, 'From: <'.$email_from.'>');

    echo json_encode($status);
    die;