Re: Message-ID's vs. Resent-Message-ID

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+ Mon, 11 Jan 2016 08:20:49 +0200 (EET)\r
+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: Erik Quaeghebeur <notmuch@equaeghe.nospammail.net>,\r
+ notmuch@notmuchmail.org\r
+Subject: Re: Message-ID's vs. Resent-Message-ID\r
+In-Reply-To: <1797484.KB5JPIe8ts@sysoppad>\r
+References: <2154153.mZhPRoAGrk@sysoppad> <m2a8odcsvx.fsf@guru.guru-group.fi>\r
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+Date: Mon, 11 Jan 2016 08:20:49 +0200\r
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+On Sun, Jan 10 2016, Erik Quaeghebeur <notmuch@equaeghe.nospammail.net> wrote:\r
+\r
+> Thanks, Tomi, for your quick response.\r
+>\r
+>> > * If yes, for resent messages\r
+>> > (https://tools.ietf.org/html/rfc2822#section-3.6.6), does notmuch use\r
+>> > (the chronologically last) Resent-Message-ID, or the Message-ID?\r
+>> \r
+>> the Message-ID\r
+>\r
+> Hmm. Is this a conscious decision, or is the resending case just not\r
+> taken into account?\r
+\r
+(most probably just) not taken into account\r
+\r
+> What happens if I have both a message and my own copy of it after\r
+> resending it to somebody else? I would like to have a record of whom I\r
+> resent it to, as with forwarded messages (where the forwarded message\r
+> does have a different message id).\r
+\r
+Both of the copies are "files" of the same message; i.e.\r
+\r
+notmuch search --output=files id:<Message-ID> will list both (all)\r
+filenames\r
+\r
+> Are the Resent-* headers of the resent message merged into the database\r
+> entry? I guess this last question is more general: with multiple messages\r
+> with the same Message-ID but differences (for whatever reason), how will\r
+> these messages be merged in the database?\r
+\r
+Database has fixed set of headers stored per message and (afaik) none\r
+of the Resent-* headers are there (merged or separate).\r
+\r
+(One thing to remember (for anyone perhaps planning to do something about\r
+this) is that if we'd use Resent-Message-ID: as message identification \r
+if it exists, then Message-ID: of the message should act as In-Reply-To:\r
+or References: -header...)\r
+\r
+Tomi\r
+\r
+> Best,\r
+>\r
+> Erik\r