[Mailman-Developers] Author_is_list option in upcoming mailman 2.1.16

[Franck Martin]

On Sep 13, 2013, at 7:48 PM, Mark Sapiro <mark at msapiro.net> wrote:

> On 09/13/2013 12:18 PM, Franck Martin wrote:
>> 
>> Mailman breaks DKIM as soon as you add a footer or tag in the subject line, which a lot of lists do (including this one).
> 
> 
> Not necessarily. It depends on the DKIM signature and how much of the
> body is signed. Granted, you are correct in most cases, but it might be
> of interest to some to go to
> <https://mail.python.org/pipermail/mailman-developers/2007-February/>
> and review the "dkim-signature headers" threads.
> 
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.

Even cisco does not use them in its signatures anymore.

Jim Fenton did a good document on DKIM threats: http://tools.ietf.org/html/rfc4686