Breaking a really long thread

diff --git a/f5/b18a2ce60099f88fd982c312627edce9fce000 b/f5/b18a2ce60099f88fd982c312627edce9fce000
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@@ -0,0 +1,72 @@
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+From: David Mazieres <dm-list-email-notmuch@scs.stanford.edu>\r
+To: notmuch@notmuchmail.org\r
+Subject: Breaking a really long thread\r
+References: <1459015043-8460-1-git-send-email-david@tethera.net>\r
+Reply-To: David Mazieres expires 2016-06-30 PDT\r
+ <mazieres-fmzyazpz6acxdkzys7pkrhp8ve@temporary-address.scs.stanford.edu>\r
+Date: Fri, 01 Apr 2016 16:57:15 -0700\r
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+\r
+For some reason, Google voice always includes a header of the form\r
+"References: <+15555555555.@txt.google.com>" (where the 5s are my actual\r
+phone number) when I get a text.  The result is that every SMS I've ever\r
+received is in a single thread containing many thousands of messages.\r
+And of course huge threads are annoyingly slow to open, particularly to\r
+read a single 140-character message.\r
+\r
+Is there any way to break an existing thread (so as to start over with a\r
+smaller thread), or otherwise to tweak the threading rules so that a\r
+particular References header gets ignored.  It's annoyingly slow to open\r
+a thread with 10,000 messages just to read one SMS.  I'm almost tempted\r
+to mangle the messages on delivery and remove the References header\r
+before notmuch sees them, but it would be nice to have a cleaner\r
+solution, as there are other situations in which one might want to\r
+"reset" a really long thread.\r
+\r
+Thanks,\r
+David\r