On Fri, Feb 13, 2015 at 7:46 AM, Steve Atkins <st...@blighty.com> wrote:

>> Such is life. Personally, I have no problem mangling or blocking messages 
>> from users using a domain with a restrictive DMARC policy as needed.
>
> Mangling encourages bad behaviour. Blocking discourages it.

Blocking, aka rejecting participation from legitimate users because of
their domain, might be easy for hobbyists to stomach, but is not
always the best path for an existing group or enterprise. It leaves
the affected end users feeling hurt and caught in the middle in a
scenario they can't easily change. (They certainly can't force AOL to
change DMARC policy and they may have legitimate reasons as to why
they don't wish to change mail providers.)

It doesn't seem to me to be a reasonable solution for everyone. That
may be why Yahoo Groups and Google Groups both chose to implement
header changes -- instead of telling subscribers to go away.

For folks looking for a point of view other than "just lock those
users out," I'd suggest checking out some of my suggestions. Looks to
me that these align with the paths taken by Yahoo and Google (and
maybe Mailman, too).

http://www.spamresource.com/2014/04/run-email-discussion-list-heres-how-to.html

And if you're looking for more in depth on DMARC policy issues like
this overall, I'd suggest looking here:

http://www.spamresource.com/search/label/dmarc

Cheers,
Al


-- 
Al Iverson | Minneapolis, MN | (312) 725-0130
aliverson.com | spamresource.com | @aliverson

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