Re: How to index arbitrary headers?

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+Date: Mon, 1 Oct 2012 11:43:09 -0400\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Petri Savolainen <petri@koodaamo.fi>\r
+Subject: Re: How to index arbitrary headers?\r
+Message-ID: <20121001154309.GE26662@mit.edu>\r
+References:\r
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+\r
+Quoth Petri Savolainen on Oct 01 at  3:39 pm:\r
+>    Hello,\r
+>    I could not find information anywhere in notmuch docs about what is\r
+>    actually indexed - specifically, what email headers are indexed and\r
+>    searchable? If a header is not indexed, does searching for its value still\r
+>    result in a search hit?\r
+>    It would be nice if one could just provide the list of headers to be\r
+>    indexed in some configuration file or something.\r
+>    Thanks,\r
+>     Petri\r
+\r
+notmuch doesn't currently implement this, though it is an\r
+oft-requested feature.  One (not insurmountable) difficulty is that\r
+the database would have to be rebuilt if a user-configured list of\r
+headers changed and there are technical limitations that prevent us\r
+from simply indexing all headers.  Out of curiosity, what headers are\r
+you interested in indexing?\r
+\r
+The currently indexed headers are described in man\r
+notmuch-search-terms.\r