RSS is great for informing readers of new content. Sadly only a few actually use it, except (unknowingly, for a large part of the population) for... Podcasts.

So, thinking out loud: you could offer people to subscribe to your website by publishing a RSS feed with dummy audio, using a link in the the episode description to get people to hop through to your website. And then you offer the appropriate "subscribe in iTunes / Spotify / generic podcasting app" buttons on your website page.

And then suddenly the masses can sign up to your updates! And they can easily unsubscribe! And you don't have to deal with email, and can use static file hosting! There'd even be a discovery inroad as presumably the Apples and Spotifies of this world will push it through the personalized recommendations pipe just as they would for any other podcast.

It's a bit subversive but it would work wouldn't it?