protected function buildMessage($body, EmailInterface $email)
    {
        $message = "To: " . $email->getTo() . "\r\n";
        $message .= "Subject: " . $email->getSubject() . "\r\n";
        $message .= $this->buildHeaders($email) . "\r\n";
        $message .= $body;

        return $message;
    }