On Fri 18/Dec/2020 21:05:43 +0100 John R Levine wrote:
Info which is encoded in such a way that only the sender can understand rises
no PII concern, IMHO. A sender could cache sent messages and devise how to
encode the corresponding filenames in DKIM selectors. Reporting just the
failed signature would leak the whole message by reference. So what?
Now he knows which forwarded recipients are talking with his users.
Are failure reports about forwarded messages still useful? If not so much,
perhaps we could deplore them.
Keeping the target of forwarded messages private needs to be addressed at
emailcore as well, though. Regular bounces leak the same info.
Best
Ale
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