I think this is the essential fact, thanks for posting. Lots of people complain about the “insecurity” of email, but as long as you want this feature (sending

I think this is the essential fact, thanks for posting. Lots of people complain about the “insecurity” of email, but as long as you want this feature (sending anyone a message knowing nothing more than just their email address), there will always be spam. And if this is a feature you can do without, then there are lots of alternative communication systems, or you can always use signatures in email.