Yup. Good spam filters are a must though unless you change email addresses often. I have had the same email address for more than ten years now. Not only that, but my primary is just my initials, so I get hit with every automatic address generating spambot on the planet. Prior to moving to some extremely powerful filters at my email provider, I was getting 200 or so spam a day, and had created filters that were basically whitelists. If you weren't on the list, you got dumped to trash.
I support the author's idea of requiring computation be a part of generating the email, but see issues with this when it is applied to some of the mailing lists I'm on that have been ongoing concerns for years. I also don't much care for a system that will do away with anonymous email, as there is a place for even such things.
I've tried to encourage folks to use encryption for years, but have pretty much given up that battle, because people just don't care, even when they should.
I agree with you about encryption. I think a substantial proportion of email should be encrypted so that the mere fact of something being encrypted wouldn't be suspicious in and of itself.
Would you use a bathroom with glass walls? Why, are you doing something wrong in there? Just rhetorical questions, not directed at you, Z.