On Fri, 02 May 2014, Santiago Vila wrote:
> Hmm. Can you elaborate on that? Do you consider that if I sign a
> message and you want to modify it, am I to blame that you can't modify
> it? Or else: If you modify it anyway, am I to blame that the signature
> does not verify anymore?

You're to blame if you're sending it to a mailing list, and are signing
the body in such a way that footers cannot be added, and have configured
your mail setup such that DKIM headers are mandatory.
 
> On the other hand, what do you mean by "people" here? Do you think
> Yahoo users are able to choose what part of their messages are signed
> by the SMTP server? I think they can't.

No, but Yahoo is capable of using DKIM and SPF as advisory information,
and ignore it for known mailing lists.
 
> If that's true, I would consider that as a proof that mail footers are
> useless, not that they are useful.

It's just proof that some people are not observant, even when the
information is clearly present. My point is that headers are hidden, and
so not only would a person have to be observant, they'd have to know to
look at the headers.
 
> Another idea, if you are worried that people will not know how to
> unsubscribe, would be to send monthly reminders a-la-mailman, to
> "supplement" lack of footers in every message.

Monthly reminder e-mails are one of the worst misfeatures of mailman. We
won't be doing that. [At least they're disabled by default for mailman,
now.]

-- 
Don Armstrong                      http://www.donarmstrong.com

My spelling ability, or rather the lack thereof, is one of the wonders
of the modern world.


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