Good question. I'm sure it's possible. (My site runs by Drupal and they have plug-ins for almost anything.) With the high volume of posts I make, it's not the route that would ordinarily occur to me. On the other hand, there are people who subscribe to the comments at File 770 and that's a firehose if I ever saw one! I'll look into it.

I do plan to set up an author e-newsletter, but it would be only a once a month (or special announcements) sort of thing.