Following on to the recent discussion about the pct tag, and specifically
the disallowing of any values other than 0 and 100, I propose the following
text and look forward to your comments:
pct: (plain-text integer; OPTIONAL; default is 100). For the
RFC5322.From domain to which the DMARC record applies, the "pct"
tag is the percentage of messages producing a DMARC result of
"fail" to which the Domain Owner wishes its preferred handling
policy be applied. However, this MUST NOT be applied to the
DMARC-generated reports, all of which must be sent and received
unhindered. Possible values are as follows:
0: A request that zero percent of messages producing a DMARC
"fail" result have the specified policy applied. While this is
seemingly a non-sensical request, this value has been given
special meaning by some mailbox providers and intermediaries
when combined with "p=" values other than "none". In those
cases, in can result in changes to message handling, and/or
DMARC reporting for the domain publishing such a policy. In
some instances of altered reporting, it is possible that the
altered reports may reveal intermediaries whose handling of the
domain owners' mail could cause it to produce a DMARC result of
"fail" when it reaches its final destination.
100: The default, in which a request is made that every message
that produces a DMARC "fail" result will be subject to
application of the specified policy.
I'll check on this thread on Monday to see where things stand...
--
*Todd Herr* | Technical Director, Standards and Ecosystem
*e:* [email protected]
*m:* 703.220.4153
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