On Apr 8, 2014, at 8:39 AM, John Levine <[email protected]> wrote:

>>> 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.
> 
> Steve actually said when people try to post.

If I were implementing it I'd actually do both. Or at least I would warn
at signup "Yahoo has forbidden you from posting to this list."

>  I tried that, since it's
> one line in the config in my list manager.  It caught a bunch of mail
> from real people going to real lists (the church lists are busy, the
> minister just said he's retiring) and I would not look forward to
> explaining to people why their mail account that has worked fine for a
> decade can't reply and say whether they're coming to this afternoon's
> meeting.
> 
> So I did the redacted From: line which was slightly harder, but moves
> the pain slightly while still encouraging people to find a new address.

Cheers,
  Steve

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