[Bug 1517446] [NEW] Please add multipart/signed to DEFAULT_PASS_MIME_TYPES

[carloslp]

Public bug reported:

Mailman tarballs contain a Defaults.py file with this configuration:

DEFAULT_PASS_MIME_TYPES =
['multipart/mixed','multipart/alternative','text/plain']

NOTE: I don't know how this file is generated, I found it on the
tarballs but not on the repository

So, when someone enables filtering on a mailing list by mime-type, the
default is to filter all emails not matching any of those 3 mime-types.

This list of default mime types allowed misses to include
"multipart/signed".

Therefore, this is unfortunately filtering any "multipart/signed"
emails.

"multipart/signed" is defined on RFC 3156
<https://tools.ietf.org/html/rfc3156> and is the recommended way of
signing mails with GPG. See http://wiki.gnupg.org/SignatureHandling

The proposed change is to modify that default configuration to:

DEFAULT_PASS_MIME_TYPES = ['multipart/mixed', 'multipart/alternative',
'multipart/signed', 'text/plain', ]

This default causes trouble to people that signs their mails with GPG. I
already had problems due to this default on the Alioth Debian mailing
lists and on the WebKit mailing lists because the admin enabled
filtering by mime-type and didn't changed the default.


Please, change this default by adding at least 'multipart/signed' to the list of types allowed.

** Affects: mailman
     Importance: Undecided
         Status: New

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Title:
  Please add multipart/signed to DEFAULT_PASS_MIME_TYPES

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