The problem I ran into was SPF-specific, so it was the envelope header.
I haven't done much with DKIM yet.
Unfortunately it appears there is some disagreement on whether From:
should be flagged if there are other headers available. Yahoo apparently
wants this to stop emails forged to be from Yahoo (sensible, since for
years yahoo email addresses were forged for spam)...but it also means
they block other legit inbound emails as well from other domains.
On 5/15/2014 12:09 PM, Matthew Barr wrote:
It is the actual from address, not the mail from (envelope).
That’s the difference between DKIM & SPF...
On May 15, 2014, at 10:21 AM, Brian O'Neill <[email protected]> wrote:
IIRC, the issue is not with the From: and Reply-To: headers, but the envelope
sender (MAIL FROM in the SMTP chatter).
Some systems, especially mailing lists, when forwarding on behalf of the
original sender, don't reset the envelope sender to the local domain, and use
the original sender's email address. You then bump into problems if the
receiving host is checking SPF and DKIM (DMARC is basically both), and the
original sender's domain has those set and have strict checking.
We ran into this when a person had their email forwarded to a yahoo account
from an Exchange 2003 server. Exchange 2003 doesn't change the envelope sender
on forwarding, but I understand that 2007 and later change the envelope sender
to be the forwarding account.
I haven't looked any deeper yet at my mailman stuff, as fortunately I don't
have any yahoo recipients or any other domain that is doing DMARC yet.
On 5/15/2014 10:15 AM, Edward Ned Harvey (bblisa4) wrote:
Before anybody says "Don't use yahoo," this is both a reasonable thing for
yahoo to do, and something that others can and should and will (like it or not) be
adopting more in the future.
Apparently yahoo recently set their DMARC policy to reject, which means yahoo
users can't participate in mailing lists such as this one.
Anybody here using yahoo? Try posting to the list, and prove or deny, that you
can't?
Here is the official mailman page on the subject:
http://wiki.list.org/display/DEV/DMARC
It seems, the solution is to enable "from_is_list" so the message will actually send "From: Edward
Ned Harvey via The List" and "Reply-To: Edward Ned Harvey <[email protected]>"
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