ModulusTools Comment Notifications brings readers back to the conversation. When someone leaves a comment, they can choose to be emailed about replies to their comment or about every new comment on that post.

Features

“Email me” choice in the comment form — replies to my comment, all new comments, or nothing. Nothing is preselected unless you choose otherwise.
Double opt-in — new subscribers confirm by email, so nobody can subscribe someone else. Logged-in users commenting with their own account email are confirmed automatically.
One-click unsubscribe in every email, including the unsubscribe button that Gmail, Outlook and Apple Mail show next to the sender.
Subscription page for readers — see and cancel all their subscriptions on your site, without an account.
Emails only for approved comments — nothing is sent for comments that are held for moderation or marked as spam.
Large lists are sent in batches with WP-Cron, one email per recipient, so addresses are never shared.
Subscriber list for admins — search, filter, delete and export to CSV under Comments Notifications.
Import from Subscribe To Comments Reloaded — copy existing subscriptions in one click. The original data is left untouched.
Privacy tools — works with the WordPress personal data export and erase tools and adds suggested text to your privacy policy guide.
Uses WordPress’s own email function, so it works with any SMTP plugin you already use. No account and no external service.

Moving from Subscribe To Comments Reloaded

Subscribe To Comments Reloaded is no longer available in the plugin directory. Install this plugin, go to Comments Notifications Import and click Import subscriptions. Active subscriptions keep working; subscriptions that were never confirmed stay “Not confirmed” and receive no emails. This plugin is not affiliated with Subscribe To Comments Reloaded or its authors.