Php form handling

Hi, I’m trying to create an a couple of online forms. The first one sends the users’ email address to an email address so they can sign up to a newsletter. At the moment I receive the test emails, but they are blank. Here’s the HTML

<form method=“post” action=“contact.php”>
Email: <input name=“email” type=“text”><br>
<input type=“submit” value=“Sign up”>
</form>

Here’s the php:

<?php
$to = "info@hotlookhair.com";
$subject = “general”;
$email = $_REQUEST[‘email’] ;
$headers = “From: customer@hotlookhair.com”;
$sent = mail($to, $subject, $message, $headers) ;
if($sent)
{print “Your mail was sent successfully”; }
else
{print “We encountered an error sending your mail”; }
?>

Any help would be appreciated