The first envelopes ever developed were by the Babylonians over 4,000 years ago. The Babylonians baked clay around documents to ensure they were protected from being read, creating a security seal which could only be broken by the intended recipient because if tampered with, the outer layer would display clear signs of damage. These early clay envelopes not only protected the text being sent but also served legal and transactional purposes (eg. containing contracts, receipts, or promissory notes...
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