Re: ask notmuch to find back "reply-to's"

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+From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
+To: Xu Wang <xuwang762@gmail.com>, notmuch@notmuchmail.org\r
+Subject: Re: ask notmuch to find back "reply-to's"\r
+In-Reply-To:\r
+ <CAJhTkNiWvED4+7kAEWxWOD2PLyskG27vTfSbmZhJFUJcoBqXag@mail.gmail.com>\r
+References:\r
+ <CAJhTkNiWvED4+7kAEWxWOD2PLyskG27vTfSbmZhJFUJcoBqXag@mail.gmail.com>\r
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+ (x86_64-pc-linux-gnu)\r
+Date: Sun, 03 Jul 2016 09:28:29 -0400\r
+Message-ID: <87inwmyhoi.fsf@alice.fifthhorseman.net>\r
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+\r
+On Sat 2016-07-02 20:28:41 -0400, Xu Wang wrote:\r
+> Hello all,\r
+>\r
+> I have a situation where sometimes I sync a later message. For\r
+> example, the following happens on times:\r
+>\r
+> 1a. sync message 1.\r
+> 1b. not much new\r
+> 2a. sync message 3 (which replied to message 2)\r
+> 2b. not much new\r
+> 3. sync message 2 (which replied to message 1)\r
+> 3b. not much new\r
+>\r
+> This happens because of my workflow of offlineimap. It takes a long\r
+> time to sync some folders so often I prefer to skip, but sometimes\r
+> they contain replies.\r
+\r
+on most systems, assuming standard headers, notmuch should indeed\r
+assemble these into the same thread.\r
+\r
+the relevant headers are In-Reply-To and References.\r
+\r
+Can you show those headers for this example?  If they have these message-IDs:\r
+\r
+ message 1: XXX\r
+ message 2: YYY\r
+ message 3: ZZZ\r
+\r
+then i'd expect the following headers:\r
+\r
+ message 1:\r
+   Message-Id: XXX\r
+    <no In-Reply-To or References>\r
+ message 2:\r
+   Message-Id: YYY\r
+   In-Reply-To: XXX\r
+   References: XXX\r
+ message 3:\r
+   Message-Id: ZZZ\r
+   In-Reply-To: YYY\r
+   References: XXX, YYY\r
+\r
+\r
+If notmuch has indexed them all, they should all be part of the same\r
+thread.\r
+\r
+        --dkg\r