Mailing lists work for something like an open source project where you have an ongoing relationship with the community. They are not suitable for one-off comme

Mailing lists work for something like an open source project where you have an ongoing relationship with the community. They are not suitable for one-off comments on a blog post. In particular, I'm not even sure how you could make it possible for a normal user using a standard mail client to reply to a comment that was posted before they came across the blog post.