On Thu, 15 May 2014, Edward Ned Harvey (lopser) wrote:
From: Brad Beyenhof [mailto:bbeyen...@icloud.com]
Ah, Reply-To munging. Last time this came up on our local LUG mailing list,
there was quite a storm of opinion. However, if making a stance NOT to
munge would prevent some people from participating, I think everybody
would've been in favor.
Well, in the past, there was a lot of room for opinion. But now and moving
forward, there isn't a lot of alternative. See this article:
http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-breaks-mailing-lists.html
(a) It's not just yahoo, this is actually a reasonable and good policy, and
it's been growing for years, and you can expect it to continue growing, and
it's only a matter of time before gmail etc do the same.
(b) When yahoo users post to a list, their mail gets distributed to
recipients of the list, and the recipient mail servers bounce the message.
So mail addressed to y...@gmail.com or m...@nedharvey.com get bounced. And
mailman is likely to unsubscribe us as a result. (Not the yahoo sender.)
Assuming the list is run on mailman, the one and only obvious correct action
is to read the DMARC page on Mailman (posted in my OP message) and choose one
of the solutions that they recommend. The most obvious of which is the
Reply-To munging.
Well, you are making quite an assumption when you say that what they are doing
is correct and that the only way to do anything going forward is to munge things
to work with Yahoo
This isn't the first time a major e-mail provider had done something stupid, and
it won't be the last (and yes, breaking mailing lists for their users with no
notice is stupid).
what will you do when two different providers insist on two contradictory
things?
This is listed as an "experiment" on the part of Yahoo. Well, the experiment is
showing that this is a bad thing to do.
If they want to quaranteen mail that doesn't pass DMARC and then run other tests
against it, that's fine. But to just reject it is not.
David Lang
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