If you use #GMail, #Google keeps records of everything you buy, even if you delete the email receipt, and even if you didn't buy the product from them. Here's metadata from my takeout showing price, delivery address, description, vendor, etc. #privacy

@gerowen PGP/GnuPG is widely criticized by usability folks, but *that* is a place where it should be more deployed.

Pretty easy for e-commerce platforms to have an option for uploading PGP keys end encrypting all notification emails with them.