Replay Email HTML format is not working

Please help me fix it

Line 216 in comment-reply-email.php should be changed from esc_attr to esc_html:

$mail_message = esc_html( $this->options[‘mail_message’] );

The entire ‘mailer’ function in the plugin code needs to be replaced by the following:

function mailer($id, $parent_id, $comment_post_id) {
    global $wpdb, $user_ID, $userdata;

    $post = get_post($comment_post_id);

    if (empty($post)) {
        unset($post);
        return false;
    }

    if ($this->options['mail_notify'] == 'admin') {
        $cap = $wpdb->prefix . 'capabilities';
        if ((strtolower((string) array_shift(array_keys((array)($userdata->$cap)))) !== 'administrator') && ((int)$post->post_author !== (int)$user_ID)) {
            unset($post, $cap);
            return false;
        }
    }

    $pc = get_comment($parent_id);
    if (empty($pc)) {
        unset($pc);
        return false;
    }

    if (intval($pc->comment_mail_notify) === 0 && ($this->options['mail_notify'] === 'parent_uncheck' || $this->options['mail_notify'] === 'parent_check')) {
        unset($pc);
        return false;
    }

    $parent_email = trim($pc->comment_author_email);

    if (empty($parent_email) || !is_email($parent_email)) {
        unset($pc, $parent_email);
        return false;
    }

    $cc = get_comment($id);
    if (empty($cc)) {
        unset($pc, $cc);
        return false;
    }

    if ($cc->comment_approved != '1') {
        unset($pc, $cc);
        return false;
    }

    if ($parent_email === trim($cc->comment_author_email)) { //Do not send email if you reply to your own comments
        unset($pc, $cc);
        return false;
    }

    $mail_subject = sanitize_text_field($this->options['mail_subject']);
    $mail_subject = str_replace('[blogname]', get_option('blogname'), $mail_subject);
    $mail_subject = str_replace('[postname]', $post->post_title, $mail_subject);

    $mail_message = wpautop($this->options['mail_message']);
    $mail_message = str_replace('[pc_date]', mysql2date(get_option('date_format'), $pc->comment_date), $mail_message);
    $mail_message = str_replace('[pc_content]', $pc->comment_content, $mail_message);
    $mail_message = str_replace('[pc_author]', $pc->comment_author, $mail_message);

    $mail_message = str_replace('[cc_author]', $cc->comment_author, $mail_message);
    $mail_message = str_replace('[cc_date]', mysql2date(get_option('date_format'), $cc->comment_date), $mail_message);
    $mail_message = str_replace('[cc_url]', esc_url($cc->comment_url), $mail_message);
    $mail_message = str_replace('[cc_content]', $cc->comment_content, $mail_message);

    $mail_message = str_replace('[blogname]', get_option('blogname'), $mail_message);
    $mail_message = str_replace('[blogurl]', esc_url(get_option('home')), $mail_message);
    $mail_message = str_replace('[postname]', $post->post_title, $mail_message);

    $permalink = get_comment_link($parent_id);
    $mail_message = str_replace('[commentlink]', esc_url($permalink), $mail_message);

    $wp_email = 'no-reply@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']));
    $from = "From: \"" . get_option('blogname') . "\" <$wp_email>";

    $mail_headers = "$from\nContent-Type: text/html; charset=" . get_option('blog_charset') . "\n";

    unset($wp_email, $from, $post, $pc, $cc, $cap, $permalink);

    $mail_message = convert_smilies($mail_message);

    $mail_message = apply_filters('comment_notification_text', $mail_message, $id);
    $mail_subject = apply_filters('comment_notification_subject', $mail_subject, $id);
    $mail_headers = apply_filters('comment_notification_headers', $mail_headers, $id);

    wp_mail($parent_email, $mail_subject, $mail_message, $mail_headers);
    unset($mail_subject, $parent_email, $mail_message, $mail_headers);

    return true;
}