php mail contact

<form action="sendemail.php">
            <input type="email" name="email" autocomplete="on" autfocus="autofocus" placeholder="ENTER YOUR EMAIL">
            <input type="submit" value="submit" name="submit">
</form>

<?php
       if(!empty($_POST))
       {
       // from the form
       $email = trim(strip_tags($_POST['email']));


       // set here
       $subject = "Contact form submitted! $email";
       $to = '24emal@gmail.com';

       $body = <<<HTML
$email
HTML;

       $headers = "From: $email\r\n";
       $headers .= "Content-type: text/html\r\n";

       // send the email
       mail($to, $subject, $body, $headers);

       // redirect afterwords, if needed
       header('Location: index.php');
       }
?>