public function img($email = '', $alt = '', array $attr = [])
    {
        if (empty($email)) {
            $email = $this->_options['email'];
        }

        $img = '<img src="'.$this->src($email, $attr).'"';

        if (!empty($alt)) {
            $img .= ' alt="'.$alt.'"';
        }

        if (isset($attr['width'])) {
            $img .= ' width="'.$attr['width'].'"';
        }

        if (isset($attr['height'])) {
            $img .= ' height="'.$attr['height'].'"';
        }

        return $img.'>';
    }