How about these:

 -- CR & NL char in rfc2047-encoded header...

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+From: tomi.ollila@iki.fi\r
+To: notmuch@notmuchmail.org\r
+Subject: How about these:\r
+ -- CR & NL char in rfc2047-encoded header...\r
+Message-ID: <1374606929.hand.crafted.4.sendmail@guru.guru-group.fi>\r
+Date: Tue, 23 Jul 2013 22:17:11 +0300 (EEST)\r
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+\r
+In thread starting from id:08cb1dcd-c5db-4e33-8b09-7730cb3d59a2@gmail.com\r
+David wondered in id:87y58xv71x.fsf@zancas.localnet what filtering\r
+is done by CLI and what by lib.\r
+\r
+But where should the "problem" presented in the Subject: header should\r
+be handled. I did some hacks to emacs client to drop the ^J (newline)\r
+characters from Subject: and From: headers but should these be filtered\r
+in CLI (or in lib) instead?\r
+\r
+Tomi\r