I looked through the logs. No duplicate message IDs over a 7-day period. -A
On Tue, Oct 8, 2019 at 1:33 PM Chris Wedgwood <[email protected]> wrote: > > The second tech arrived at the conclusion that it was the Message-Id > > header. Messages that were delivered had an externally-resolvable domain > > as part of the Message-Id header. Messages that were 'disappeared' had > our > > internal domain (i.e. whatever.local) as part of the Message-Id. > > > > I renamed one of the copiers to use our external domain and suddenly it > > worked perfectly. > > is there any chance you are reusing message-ids (bad randomness?) > > iirc gmail deduplicates per-user per-message-id (some people rely on > this) >
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