On Thu 31/Dec/2020 17:00:29 +0100 John Levine wrote:
In article <[email protected]> you write:
Many Girl Scout troops were affected when Yahoo published p=reject. Which is
probably why John brought it up. This isn’t a hypothetical, this is things that
we know actually happened and real world effects of DMARC.
I'd guess the problem they experienced have been mailing list and submissions
using ISP's bundled services or similar unauthorized MSAs. The former is fixed
by From: rewriting, the latter has no possible fix.
Not a good guess. Please review previous messages in this thread for clues.
Ah, yeah, the ESPs. Besides dmarc=fail, they also trigger some SA macros, such
as FORGED_GMAIL_RCVD, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,
FROM_EXCESS_BASE64, HEADER_FROM_DIFFERENT_DOMAINS, HTML_IMAGE_RATIO_04,
HTML_MESSAGE, ...
Are there other unwanted effects?
The main effect is that the mail they'd been sending from their ESP
with their Yahoo address on the From: line used to work, and now falls
on the floor or worse.
Why can't the ESPs do From: rewriting?
Best
Ale
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