notmuch-mutt: support for messages that lack Message-ID headers (v3)

diff --git a/3a/cedf435d4d3911800fb1301fde56f481ecfff8 b/3a/cedf435d4d3911800fb1301fde56f481ecfff8
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+From: Stefano Zacchiroli <zack@upsilon.cc>\r
+To: notmuch@notmuchmail.org\r
+Subject: notmuch-mutt: support for messages that lack Message-ID headers (v3)\r
+Date: Sun, 15 Feb 2015 13:39:05 +0100\r
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+\r
+Take #3 on adding support for messages that lack Message-ID headers to\r
+notmuch-mutt. For context see:\r
+- http://notmuchmail.org/pipermail/notmuch/2015/thread.html#20171\r
+- http://notmuchmail.org/pipermail/notmuch/2015/thread.html#20079\r
+\r
+I've rewritten the patch taking into account the suggestions by Tomi\r
+Ollila, who suggested a much cleaner approach for processing headers\r
+and possibly fallback to synthetic Message-IDs (thanks Tomi!).\r
+\r
+I'll be happy to hear further comments on this patch series.\r
+If there are none, please merge it into master.\r
+\r
+Cheers.\r
+\r