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Re: [ietf-smtp] ietf-smtp(_at_)ietf(_dot_)org and DMARC with p=quarantine; pct=0

2019-01-25 14:06:45
On Fri, Jan 25, 2019 at 1:29 AM Дилян Палаузов 

DNS TXT contains “v=DMARC1; p=quarantine; pct=0;
rua=mailto:akamai(_at_)rua(_dot_)agari(_dot_)com, mailto:
ruf=mailto:akamai(_at_)ruf(_dot_)agari(_dot_)com; sp=none”.
The MLM does not rewrite From:.  Delivering the
email to the mailing lists recipients leads to failed DMARC and a (not
aggregated) report is generated per delivered

Shouldn’t ietf-smtp(_at_)ietf(_dot_)org change the From:, when for the domain
p=quarantine is set, just as for p=reject, in order
to avoid generating useless reports, and ensuring delivered emails?
(Handling “quarantine” as “reject” on the
recipients’ side is not neccesary wrong).

Based on the definition of how "pct" is handled, 0% of the messages going
through DMARC evaluation should be affected. The DMARC spec says:

(6.3) Percentage of messages from the Domain Owner's mail stream to which
the DMARC policy is to be applied.  However,

(6.6.4) If the "pct" tag is present in the policy record, the Mail Receiver
MUST NOT enact the requested policy ("p" tag or "sp" tag") on more than the
stated percent of the totality of affected messages.

When implementers are doing "funny stuff" like selectively manipulating
from addresses, it is debatable as to what the absolute "right" thing is
since the definition of non-sampled message treatment is one level less
than the "p=" specification - in this case that would be "none".

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