On 16/05/2025 22:30, Mark Fletcher via mailop wrote:
The problem, in short, is that when delivering list emails, Yahoo
requires the header-from email address to be rewritten for some domains
but not others (regardless of DMARC policy).
Yes, we saw that, starting in early November of last year.
Thanks for confirming that it's not just my imagination :)
Sure, we could rewrite all emails that are being delivered to Yahoo,
but
that seems overkill for such a small percentage of failures.
This was the last straw, so to speak, that caused us to switch to re-
writing the From line if a domain has *any* DMARC record. Previously, we
did not re-write the From line for domains with a p=none DMARC record.
But that had the issue where we'd get probably one or two support
inquiries a week from people doing initial rollouts of DMARC, with
p=none, then looking at the resulting reports, and seeing 'problems'
with email from us.
Yes, that sounds familiar, we get that too. Fortunately not too many,
and at least at the moment a manageable amount.
Andy
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