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With the benefit of 25 years' hindsight, he says what he'd do differently is "not much." Today, of course, "I'd make authentication a fundamental part of the system." But back then there were no encryption products; he'd have had to do it with passwords. Things like extensibility, and getting reply codes right were added later — "minor engineering problems". Email, he says, "isn't that hard to grok"; what's hard is dealing with error correction.