- Use a message envelope https://blog.frankdejonge.nl/use-a-message-envelope/ 9 comments php
- Occupy movements could use prepaid envelopes intended for credit card applications to send a message to the banks. http://abcnews.go.com/blogs/business/2011/10/video-suggests-another-approach-to-occupying-wall-street-send-them-garbage/ 27 comments politics
- Before Envelopes, People Protected Messages With Letterlocking: For centuries, senders used folds, slits, and wax seals to guard correspondence from prying eyes. https://www.atlasobscura.com/articles/what-did-people-do-before-envelopes-letterlocking?utm_medium=atlas-page&utm_source=twitter 9 comments books