On 2016-04-22 at 12:41, Lisi Reisz wrote: > On Friday 22 April 2016 13:56:49 The Wanderer wrote: >> Interesting. Do you have any evidence for the idea that it uses >> more than just Message-ID? I can't prove that it doesn't, but I've >> never seen anything that I recall to indicate that it does. > > It doesn't use MORE than the message ID. It doesn't use the message > ID, so far as I can see, at all. It uses the subject header. That is > why those using the Gmail interface munge threads so appallingly.
That's for threading purposes, though. I'm talking about what it uses for detecting duplicates so it can discard them; it obviously can't be using the Subject header for that, or users would never see more than one message per change of Subject. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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