El 02/05/14 19:07, Don Armstrong escribió:
Control: retitle -1 Do not append footers to messages with DKIM headers
On Fri, 02 May 2014, Santiago Vila wrote:
For a lot of years this has not been a big problem, but now Yahoo and
others are using a policy called DMARC (built on top of DKIM and SPF)
and at least Yahoo is actually rejecting messages failing these kind
of digital signatures.
The solution is for people to either not sign the bodies of the messages
that they are sending, or use Body Length Limits to limit the signature
to only the parts of the body which they are sending.
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?
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.
> [...]
Furthermore, we already get numerous unsubscription requests from people
who are unable to read the footer, and moving them into the headers
would increase those requests even more. I'm not willing to do that for
all mail.
If that's true, I would consider that as a proof that mail footers are
useless, not that they are useful.
(BTW: Strictly speaking, it would not be "moving" them into the headers,
as they are already in the headers. It would be just removing duplicate
information).
However, an interesting alternative possibility might be to just not
attach footers to messages which contain DKIM headers, as we already do
for messages which are signed.
1: https://tools.ietf.org/html/rfc6377#section-3
I believe that would be a *very* good start, indeed.
Please go ahead! :-)
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.
It may be true that some users are dumb, but by including the
unsubscription info in every message (as opposed to once a month) we are
treating *all* of them as dumb. This is not nice. A reminder a week, or
a reminder a month, should be enough.
If you decide to explore this idea, I believe a single message telling
the user all the lists he/she is subscribed to would be better than "n"
messages (one for list).
Thanks.
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