@colinwalker I have subscribed to, and subsequently unsubscribed from, a lot of newsletters over the years. I find that the one's I'm left with (probably about 5) are the one's that serve a clear purpose, provide clear value, and that I can be in-and-out of very quickly.
For what it's worth, I don't think the inbox is where interesting and thoughtful content belongs. That sort of writing belongs on the open web, where it can be indexed and enjoyed by anyone who stumbles upon it at any time, not just those who were in the right place at the right time.
I'll now contradict myself to some extent by saying that I've developed a similar unscratched itch try podcasting over recent years.