Automatic suppression of non-duplicate messages

diff --git a/ca/f21fb0732121a0ddf68f9e7e4668a7374b09fe b/ca/f21fb0732121a0ddf68f9e7e4668a7374b09fe
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+From: Eirik Byrkjeflot Anonsen <eirik@eirikba.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: Automatic suppression of non-duplicate messages\r
+Date: Sat, 03 Nov 2012 11:17:18 +0100\r
+Message-ID: <87mwyz3s9d.fsf@star.eba>\r
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+\r
+As has been mentioned a few times before, notmuch chooses to silently\r
+drop any message that has the same message-id as an already-seen\r
+message.\r
+\r
+In another thread, Austin Clements said:\r
+\r
+> notmuch tracks all copies of a message, but its output generally shows\r
+> messages, rather than files, so you see a message only once regardless\r
+> of how many copies there are in the file system.\r
+\r
+That's not what I see.  If I search for a term that only appears in one\r
+of the "copies", none of the copies are included in the search result.\r
+\r
+This is with:\r
+$ dpkg -l | grep notmuch | <remove uninteresting stuff>\r
+ii  libnotmuch3                                    0.13.2-1\r
+ii  notmuch                                        0.13.2-1\r
+ii  notmuch-emacs                                  0.13.2-1\r
+\r
+\r
+However, I still find it a much bigger problem that notmuch will\r
+silently and automatically discard new mail without letting me know that\r
+they exist, let alone allow me to read them.  (I.e. when receiving a new\r
+mail that happens to have the same message-id as a previously received\r
+mail.)\r
+\r
+Personally, I find almost no cost in seeing all near-duplicates of the\r
+same message (a cost that could be further mitigated by clever\r
+presentation).  Conversely, I find a huge cost in never seeing some\r
+messages at all.\r
+\r
+This is currently the main issue that keeps me from switching to\r
+notmuch.  (Importing my mail into notmuch dropped roughly 6800 mails.\r
+I'm sure most of these mails are near-duplicates, but I've found 34\r
+mails so far that are emphatically not.)\r
+\r
+I think it is a nice and useful design to use the message-id as the\r
+unique id to refer to a specific message.  Most of the time, this will\r
+work just fine.  However, it is less useful to blindly trust that this\r
+will always work correctly.\r
+\r
+eirik\r