[Mailman-Developers] Author_is_list option in upcoming mailman 2.1.16

[Franck Martin]

On Sep 14, 2013, at 5:16 PM, Stephen J. Turnbull <stephen at xemacs.org> wrote:

> Franck Martin writes:
> 
>> Unfortunately z= and especially l= are not used practically by
>> senders because they create a risk. One could add an attachment
>> containing malware to the message for instance.
> 
> Indeed, we have to assume that the MUAs are broken in this respect.
> See Daniel Gillmor's posts on the problems MUAs have with indicating
> which parts of a message are signed MIME parts in the "testing MUAs"
> thread.
> 
> The basic state of the art seems to be that MUAs can't handle anything
> safely except a signature that applies to the whole message.
> 


I'm not sure if DKIM was ever meant to be exposed to the end user, but the current trend is to try to protect the end user as much as possible and this is done best by MTAs than MUAs.