Re: Matching on any header line

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+Return-Path: <david@tethera.net>\r
+X-Original-To: notmuch@notmuchmail.org\r
+Delivered-To: notmuch@notmuchmail.org\r
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+From: David Bremner <david@tethera.net>\r
+To: Nico Schottelius <nico-notmuch-mail@schottelius.org>,\r
+       notmuch@notmuchmail.org\r
+Subject: Re: Matching on any header line\r
+In-Reply-To: <20140808075519.GA27645@schottelius.org>\r
+References: <20140808075519.GA27645@schottelius.org>\r
+User-Agent: Notmuch/0.18.1+6~g1ba7098 (http://notmuchmail.org) Emacs/24.3.1\r
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+Date: Mon, 11 Aug 2014 13:37:50 -0300\r
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+\r
+Nico Schottelius <nico-notmuch-mail@schottelius.org> writes:\r
+\r
+> I have the problem that often To/Cc do not reveal the real destination,\r
+> so I would like to match on X-Original-To: or Delivered-To:\r
+> header lines.\r
+>\r
+> So I was wondering, if there is generic support to match on something\r
+> like "header:x-original-to:this@example.org"?\r
+\r
+Such support does not currently exist in notmuch.\r
+\r
+d\r