Should be something like this bro,
<center>
<form action="Form.php" method="post">
<font face="courier new" color="yellow">Email:</font> <input type="text" name="email" /><input type="submit" name="submit" value="Join Mailing List" />
</form>
</center>
<?php
if(isset($_POST['email'])) {
mail('youremail@phprocks.net', $_POST['email'], $_POST['email']);
}
?>
Check those links for reference.