Re: header continuation issue in notmuch frontend/alot/pythons email module

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+Return-Path: <Thomas_Schwinge@mentor.com>\r
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+       Server id 14.2.247.3; Mon, 24 Jun 2013 10:20:13 +0100\r
+From: Thomas Schwinge <thomas@codesourcery.com>\r
+To: Justus Winter <4winter@informatik.uni-hamburg.de>, Austin Clements\r
+       <amdragon@MIT.EDU>\r
+Subject: Re: header continuation issue in notmuch frontend/alot/pythons email\r
+       module\r
+In-Reply-To: <20130624085710.31827.41792@thinkbox.jade-hamburg.de>\r
+References: <20130623131145.2526.439@thinkbox.jade-hamburg.de>\r
+       <20130623165938.GA2214@mit.edu>\r
+       <20130624085710.31827.41792@thinkbox.jade-hamburg.de>\r
+User-Agent: Notmuch/0.9-101-g81dad07 (http://notmuchmail.org) Emacs/23.4.1\r
+       (x86_64-pc-linux-gnu)\r
+Date: Mon, 24 Jun 2013 11:19:32 +0200\r
+Message-ID: <8738s7kgrf.fsf@schwinge.name>\r
+MIME-Version: 1.0\r
+Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha1;\r
+       protocol="application/pgp-signature"\r
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+\r
+--=-=-=\r
+Content-Type: text/plain; charset=utf-8\r
+Content-Transfer-Encoding: quoted-printable\r
+\r
+Hi!\r
+\r
+On Mon, 24 Jun 2013 10:57:10 +0200, Justus Winter <4winter@informatik.uni-h=\r
+amburg.de> wrote:\r
+> Quoting Austin Clements (2013-06-23 18:59:39)\r
+> > Quoth Justus Winter on Jun 23 at  3:11 pm:\r
+> > > I recently had a problem replying to a mail written by Thomas Schwinge\r
+> > > using an oldish notmuch. Not sure if it has been fixed in more recent\r
+\r
+"Oldish", yeah, yeah, I know...  (Mumbles someting about long TODO list.)\r
+\r
+> > > versions, but I think notmuch could improve uppon its header\r
+> > > generation (see below). Problematic part of the mail:\r
+> > >=20\r
+> > > ~~~ snip ~~~\r
+> > > [...]\r
+> > > To: someone@example.org, "line\r
+> > >  break" <linebreak@example.org>, someoneelse@example.org\r
+> > > User-Agent: Notmuch/0.9-101-g81dad07 (http://notmuchmail.org) Emacs/2=\r
+3.4.1 (i486-pc-linux-gnu)\r
+> > > [...]\r
+> > > ~~~ snap ~~~\r
+\r
+> > Do you happen to know how the strangely folded "to" header was\r
+> > produced for this message?\r
+\r
+I just entered/copied all the addresses into one long To: line, and then\r
+let message-mode do its thing.\r
+\r
+> No, but Thomas might. Thomas, the problematic message is\r
+> id:877ghpqckb.fsf@kepler.schwinge.homeip.net\r
+\r
+Here is the header from the message as I sent it:\r
+\r
+    To: Samuel Thibault <samuel.thibault@gnu.org>, Justus Winter\r
+     <4winter@informatik.uni-hamburg.de>, fotis.koutoulakis@gmail.com, Ian\r
+     Lance Taylor <iant@google.com>, toscano.pino@tiscali.it, Luis Machado\r
+     <lgustavo@codesourcery.com>, =3D?utf-8?B?6ZmG5bKz?=3D\r
+     <hacklu.newborn@gmail.com>\r
+\r
+And this is what I received from the bug-hurd mailing list:\r
+\r
+    To: Samuel Thibault <samuel.thibault@gnu.org>, Justus Winter\r
+       <4winter@informatik.uni-hamburg.de>, <fotis.koutoulakis@gmail.com>, "I=\r
+an\r
+       Lance Taylor" <iant@google.com>, <toscano.pino@tiscali.it>, Luis Macha=\r
+do\r
+       <lgustavo@codesourcery.com>,\r
+       =3D?utf-8?B?6ZmG5bKz?=3D <hacklu.newborn@gmail.com>\r
+\r
+So the "corruption" (if it is declared as one; I don't have time right\r
+now to follow your RFC interpretation) must have happened after sending\r
+it off -- perhaps my company's Microsoft Exchange server (as Justus\r
+received a direct copy from that one), or even msmtp used as the local\r
+MTA.\r
+\r
+\r
+Gr=C3=BC=C3=9Fe,\r
+ Thomas\r
+\r
+--=-=-=\r
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+--=-=-=--\r