On Aug 23, Brian E Carpenter <[email protected]> wrote: > Actually I think you should quibble. The issue isn't "bad" software > used by intermediaries, it's that by design DMARC p=reject breaks a > very common model used by intermediaries. Whether that is a bug or a > feature in DMARC is out of scope for this thread, however. I was not referring to the mailing lists issue, which is not relevant unless you also use DMARC with p=reject, but to broken MTAs which mangle forwarded messages (look for DKIM validation failures and you will easily find many). There is a reason if DMARC was designed to use both SPF and DKIM.
-- ciao, Marco
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