Paper trails. Absolutely. The concept of keeping a recipient-owned copy of a message is as ancient as the invention of money and writing itself - it's absolutel

Paper trails. Absolutely. The concept of keeping a recipient-owned copy of a message is as ancient as the invention of money and writing itself - it's absolutely critical for messages with legal effects, like receipts. Imagine if a fraudster could change the content of their original messages after the scam was done! Yes, Google could implement an audit trail mechanism, but that would be obscure and extremely confusing.