The email forwarding of forum posts now only handles new questions

Since around the middle of March (maybe even earlier; I haven't checked carefully), it is only occasionally that I receive posts from this forum which are replies; I now get almost only the new questions. Since I try to follow the forum via email (it is far easier that way), it means that it is now very much less useful to me. (The last time I received any "Re:"-posts was 31 March; before that, they were few and far between.)

Can anyone tell me what might have happened and how it could be rectified?

Mats