Comment Notify

module_name
comment_notify
Description

Allows users to receive emails for replies to their comments (or optionally for all comments on a node).  Can be toggled by content type (although not by comment type, if you have more than one comment entity).  In permissions, you can also control which roles can subscribe.  Can also set it so the author of a node also automatically gets emailed for every comment.

I'm using three patches:

I also have a site which uses two comment types; I wrote a patch to turn off the notification checkbox for one of them.

Tested by me
Yes
Drupal 8 support
Yes
Essential
Yes
Avoid
No
Deprecated
No