Package: mutt
Version: 1.5.13-1.1
Severity: minor

Some broken mail processing software (I'm thinking particularly of
crm114 here, though other things could do the same) when processing
e-mail that contains a Message-ID header so that it also contains a
Message-Id header.  mutt, presumably in order to improve
interoperability, will accept either spelling of the header name and
appears to accept the last one.  

Unfortunately in the case of crm114 what it's doing is trying to add a
comment to the Message-ID; what it actually ends up doing is creating a
Message-Id field consisting only of a comment.  This means that mutt
winds up thinking there is no Message-ID at all, breaking threading.  It
would help matters if mutt were to ignore empty Message-I[dD] headers
without assuming they were the only instance of that heaeder.

Obviously, the problematic messages broken and the software generating
them needs to be fixed: this is just a suggestion for an
interoperability enhancement.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: powerpc (ppc)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-powerpc
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)

Versions of packages mutt depends on:
ii  exim4                     4.63-17        metapackage to ease exim MTA (v4) 
ii  exim4-daemon-light [mail- 4.63-17        lightweight exim MTA (v4) daemon
ii  libc6                     2.3.6.ds1-13   GNU C Library: Shared libraries
ii  libdb4.4                  4.4.20-8       Berkeley v4.4 Database Libraries [
ii  libgnutls13               1.4.4-3        the GNU TLS library - runtime libr
ii  libidn11                  0.6.5-1        GNU libidn library, implementation
ii  libncursesw5              5.5-5          Shared libraries for terminal hand
ii  libsasl2-2                2.1.22.dfsg1-8 Authentication abstraction library

Versions of packages mutt recommends:
ii  locales                     2.3.6.ds1-13 GNU C Library: National Language (
ii  mime-support                3.39-1       MIME files 'mime.types' & 'mailcap

-- no debconf information


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