HTML emails in PHP

sendemail.php

<?php

$email = array(
  'fromName' =>       'Adam',
  'fromEmail' =>     'adam@example.com',
  'toName' =>         'Bob',
  'toEmail' =>       'bob@example.com',
  //'cc' =>       'charles@example.com',
  'subject' =>  'Website Change Request',
  'body' => 'Hello,<br>Bye',
  'headers' => "From: ".$email['fromName']." <".strip_tags( $email['fromEmail'] ).">\r\n".
    "Reply-To: ".$email['fromName']." <".strip_tags( $email['fromEmail'] ).">\r\n".
    //"CC: ".$email['cc']."\r\n".
    "MIME-Version: 1.0\r\n".
    "Content-Type: text/html; charset=utf-8\r\n",
);

echo mail( $email['to'], $email['subject'], $email['body'], $email['headers']);