Dave,
First, this is one of the simplifications we get by the change that the
working
group agreed to, with the RFC4871 Update about to be formally approved, and
with
the use of SDID, rather than AUID, in ADSP: the issue of a "parent"
disappears.
All that is left is the more general question of deciding how to
distinguish
among outgoing mail streams with different SDID values.
If what you are saying is that the subdomain check is deprecated, that's
fair. But that doesn't mean the check is incompatible.
Second, either the d= matches the domain in the rfc5322.From field, or it
doesn't. There is no complexity or subtlety to the test, so there are no
"implications" that need to be pointed out.
This is unresponsive to Jim's point.
Eliot
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