Comments Subscriber is a WordPress plugin that simply adds a subscription checkbox to your WordPress comments form to let your visitors subscribe to comments.
They will then be notified by email when others comment on the same post. Works automatically upon activation, no settings required.
安装:
Upload comments-subscriber folder to the /wp-content/plugins/ directory
Activate the plugin through the 'Plugins' menu in WordPress
Use the Settings->Comments Settings screen to configure the plugin