Include an email body for newsletter signup

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HTML

PHP

I am a newbie when it comes to php and I am trying to use it for a simple newsletter signup form. the html form has an input field for users to enter their emails and submit

The form works well and it sends a blank email to the address specified in the php code. I would like the email body to have something like "I would like to signup for your newsletter instead of being blank.

The php code is;

<?php

$emailmanager = 'test@example.com';

error_reporting(0);

$email = trim($_POST['email']);
$Ok = ereg("^([a-zA-Z0-9_\.-]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$", $email);
if ($Ok) {
    mail($emailmanager,'New NewsFlash Subscriber','','From: '.$email);

    if(!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$",$UNameFrm))
    {
    ?>
<script language = 'javascript'>
    alert('Thank you, your address was added to our Mailing List');
    history.go(-1);
    </script>
<?
    exit();
    }
}

else {
    if(!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$",$UNameFrm))
    {
    ?>
<script language = 'javascript'>
    alert('Sorry, please provide a valid Email address.');
    history.go(-1);
    </script>
<?
    exit();
    }
}
?>

Your help will be highly appreciated