> 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) _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
