G'day.
The method of finding the organizational domain should be specified
outside of the base DMARC specification. I suggested this back during
the PSD discussion.
There are a number of reasons:
1. There is already an installed base using the PSL. While I understand
the desire to move away from it, the change might or might not happen
and if it does, it will take a potentially long time. During all of
that time, field operations will be non-compliant with the DMARC
specification.
Note that success for tree walk requires a) receivers to attempt it,
and b) operational experience to be satisfying. Good ideas often
turn out not to succeed... Again, at the very least, it will take
an unknown amount of time for there to be enough uptake of this
replacement mechanism. And the incentives for that uptake are
frankly not all that clear; do we have solid documentation of
widespread dissatisfaction with the use of PSL in DMARC? (I'm not
asking about the logic, but about the basis for claiming widesprea
market dissatisfaction.)
2. In spite of the current fashion that encourages use of tree walk, it
does not have prior field experience and in fact runs contrary to
long-standing, established practices. While it might prove good to do
and even better than PSL, it is, by its nature, an experimental
mechanism. Including it inside the base DMARC specification encourages
treating that base specification as an experiment.
3. The base DMARC specification needs to define the construct of an
organizational domain and it needs to specify how one is used in DMARC
operation. It does /not/ need to specify how to obtain one. Given that
we will have (at least) two different methods, it is cleaner and safer
to partition the 'how' out of the core, leaving only the 'what'.
4. To the extent that there is a view that having tree walk inside the
base spec somehow encourages or forces adoption, experience tends to
show that, instead, it makes the transition confusing. Also, see points
1 & 2, above.
d/
--
Dave Crocker
[email protected]
408.329.0791
Volunteer, Silicon Valley Chapter
Information & Planning Coordinator
American Red Cross
[email protected]
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