Re: Automatic suppression of non-duplicate messages

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+From: Eirik Byrkjeflot Anonsen <eirik@eirikba.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: Re: Automatic suppression of non-duplicate messages\r
+References: <87mwyz3s9d.fsf@star.eba> <87390qxvb4.fsf@maritornes.cs.unb.ca>\r
+       <87390pf14v.fsf@nikula.org>\r
+Date: Mon, 05 Nov 2012 16:22:30 +0100\r
+In-Reply-To: <87390pf14v.fsf@nikula.org> (Jani Nikula's message of "Mon, 05\r
+       Nov 2012 00:34:40 +0200")\r
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+\r
+Jani Nikula <jani@nikula.org> writes:\r
+\r
+> On Sat, 03 Nov 2012, David Bremner <david@tethera.net> wrote:\r
+>> Offhand I'm not sure of a good method of automatically deciding what is\r
+>> the same message (with e.g. headers and footer text added by a mailing\r
+>> list).\r
+>\r
+> Assuming there was good method, what would you do with two different\r
+> messages that have the same message id? That is the unique id we use to\r
+> identify messages (which should be fine per RFC 5322 and its\r
+> predecessors; we're talking about messages from broken systems here).\r
+\r
+We're also talking about data from "untrusted" sources.  Assuming that\r
+such data is always non-broken seems overly optimistic.  (See\r
+e.g. http://cr.yp.to/immhf/thread.html, the section "Security and\r
+reliability issues" for one view on the matter.)\r
+\r
+In fact, I'd say that it should be a design goal for any mail client to\r
+deal with as much invalid input as possible.  Show big, fat warning\r
+messages if you want to, but don't just drop the message and pretend it\r
+does not exist.\r
+\r
+eirik\r