[Pkg-mailman-hackers] Bug#802047: mailman folds the DKIM-Signature header with spaces and breaks DKIM verification

[Russell Coker]

Package: mailman
Version: 1:2.1.15-1+deb7u1
Severity: normal

When Mailman unfolds and refolds the DKIM-Signature header it replaces tabs 
with spaces.  This makes the difference between a message that passes according 
to /usr/bin/dkimproxy-verify (part of the libmail-dkim-perl package in 
Unstable) and one that fails.

If there was some special case code to use tabs for the DKIM-Signature header 
then that should solve the problem of Mailman breaking DKIM signatures without 
causing any other problems (like the previous problem of tabs in the Subject 
header).

-- System Information:
Debian Release: 7.9
  APT prefers oldstable
  APT policy: (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages mailman depends on:
ii  apache2-mpm-prefork [httpd]  2.2.22-13+deb7u6
ii  cron                         3.0pl1-124
ii  debconf [debconf-2.0]        1.5.49
ii  libc6                        2.13-38+deb7u8
ii  logrotate                    3.8.1-4
ii  lsb-base                     4.1+Debian8+deb7u1
ii  pwgen                        2.06-1+b2
ii  python                       2.7.3-4+deb7u1
ii  ucf                          3.0025+nmu3

Versions of packages mailman recommends:
ii  postfix [mail-transport-agent]  2.9.6-2

Versions of packages mailman suggests:
pn  listadmin     <none>
pn  lynx          <none>
ii  spamassassin  3.3.2-5+deb7u3

-- Configuration Files:
/etc/init.d/mailman changed [not included]

-- debconf information excluded