Like it was mentioned, I would remind that BATV is a modification of
SES which came from SPF community.
Actually, it's the other way around. BATV came first under some other
name that I forget now, SES added a lot of extra junk to it to come up
with what I have always seen as an inferior version of DK. BATV is
deliberately simple and works unilaterally, without recipient hosts
needing to know anything about it.
The BATV documents point out that if there is a per-domain public key
system like DK or DKIM, it would not be hard to do a version of BATV
with signatures that could be verified remotely, but that is something
to think about after we're done with DKIM.
In the meantime, how about that taxonomy?
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