[Tickets #12952] Re: PGP/MIME signed message with user signature fails in thunderbird

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Ticket URL: http://bugs.horde.org/ticket/12952
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  Ticket             | 12952
  Updated By         | Michael Slusarz <slusarz at horde.org>
  Summary            | PGP/MIME signed message with user signature fails in
                     | thunderbird
  Queue              | IMP
  Version            | 6.1.6
  Type               | Bug
  State              | Feedback
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Michael Slusarz <slusarz at horde.org> (2014-02-24 23:53) wrote:

> E.g. the phrase "[SP]gestern[SP]bei[SP]" got broken to   
> "[SP]geste=[LF][SP][SP][LF]rn[LF]bei[SP]" (hex: 20 67 65 73  74 65  
> 3d 0a 72 6e 20 20 0a 62 65 69 20 )

What version of PHP?  The PHP quoted-stream stream filter was broken  
until recently - I provided a stream of patches upstream to PHP to fix  
the issue.

i.e. this sounds exactly like this issue:

commit 600d6deef9c8983eb8023171c6c5ae90ca60b6c1
Author: Michael M Slusarz <slusarz at curecanti.org>
Date:   Thu Feb 7 12:37:52 2013 -0700

     Fix #64166: quoted-printable-encode stream filter incorrectly  
discarding whitespace

     If trailing whitespace on a line is detected, mark the linebreak as a
     soft linebreak.

You should be using at least PHP 5.4.25 when testing.