Hey is a fantastic email service that is about to get a whole lot better as you can send email to the world which will be published on your personal Hey blog.

When I write a certain kind of email — aka a blog post — why do I have to address it to someone? Why can't I just address my thoughts to the world? Direct to the web for anyone and everyone? Rather than define the recipients, I just write and let the recipients find me.
Jeroen Sangers @jeroensangers