Re: [ietf-822] A permission to re-sign header

[Theodore Ts'o <[e-mail]>]

On Sat, Apr 19, 2014 at 09:05:23AM -0400, Michael Richardson wrote:
> 
> Yes, in particular, it's quite likely both DKIM and S/MIME signatures will
> not survive some things the mailing list might want to do, including:
> 
> 1) removing html parts or other attachments
> 2) formatting html part to text/plain
> 3) formatting text/plain; format=outlook into proper format=flowed
> 

We may need to consider whether this is something that we have to give
up.  I'm not sure how important it is to allow mailing lists to remove
html parts, etc.  If mailing lists need to simply reject messages that
have html parts, there are mailing lists that do that already, just as
their are mailing lists that reject messages that dont' meet other
administrative prohibition --- such as the e-mail being too large, for
example.

There are mailing lists that want to "fix" broken messages, yes, but
if we need to provide end-to-end assurance that the message really
came from the originator, disallowing this behavior so that things
like S/MIME and PGP signatures don't get broken might be an
engineering tradeoff that we might have to make.

Cheers,

					- Ted