On 04/08/2014 06:58 PM, Murray Kucherawy wrote:
On 4/8/14 7:23 AM, "Dave Crocker" <[email protected]> wrote:
On 4/8/2014 9:13 AM, Steve Atkins wrote:
It's easy to fix mailing lists without that loss of functionality.
Block any attempt to post to a mailing list from a domain that
publishes strict DMARC. That doesn't affect functionality for
legitimate users and it complies with the domain owners
wishes (however misguided).
That's clever, and oddly constructive. It informs the user of the issue
at exactly the right time: when the subscription is being attempted and
the user is focused on the possibility of the subscription having
problems. Much better than indirect and obscure notification later,
after posting a message.
This was suggested some years ago, when we did RFC6377.
I agree it (=subscription time) might be the right moment, but it won't
solve problems like this one introduced by Yahoo. It will only apply to
new subscribers, not to the currently subscribed addresses.
On the other hand, this has the classic problem of requiring mailing
lists to change. That is, this approach does not help anyone currently
and won't help much for a very long time, if ever.
That's true. I'm having some trouble with the notion that MLMs need to be
immune from change because they somehow have that status.
As has been stated before, MLM's are not the only problem. In general,
the IETF has always been reluctant to standardize new protocols that
would break the existing Internet ecosystem. This was not without a reason.
You're right that this is a paradigm change. Just to clarify, are you
saying those should be off the table outright, or merely that the
community really really needs to understand the implications?
Can you describe what you mean with 'community'? Do you mean with that:
senders (like Yahoo!) publishing a DMARC p=reject policy? Or do you
mean: all admins who have spent their valuable time today to prevent
collateral damage caused by this move of Yahoo!?
/rolf
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