For a long time, PG has been using a Comment Subscription plugin (Subscribe to Comments Reloaded) for the purpose of permitting visitors to TPV who make a comment on a blog post to sign up for e-mail notification when others make comments to that same post.
He has received notices that some visitors are not receiving the link this plugin should provide so they can choose to receive such email notifications.
Peering into the dim innards of TPV, PG sees what appear to be people who are successfully subscribing to and receiving these notifications.
PG would appreciate it if those who have used or wish to use this comment subscription function are having problems or if the service is operating properly.
He has looked at alternatives but would like to know if this is a general or specific problem so he can make a wise decision about which way to go.