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2018-04-18v2: generate better Message-IDs for duplicates
While hunting duplicates, I noticed a leading '-' in some Message-IDs as a result of RFC4648 encoding. While '-' seems allowed by RFC5322 and URL-friendly (RFC4648), they are uncommon and make using Message-IDs as arguments for command-line tools more difficult. So prefix them with a datestamp to at least give readers some sense of the age. And shorten the "localhost" hostname to "z" to save space.