Has this been proposed? I'd support it since it avoids most of the
problems with the existing approaches.
I've mentioned it once or twice. Noone else has, as far as I know.
Wasn't quite sure whether I was overlooking something obvious or
everyone.
It could still be made extensible if the RR listed the servers and the
needed test data (MAIL-FROM, From:, Message-ID:, Date:, ...). The
size of that RR would not be prohibitively large.
I think things like this *have* been proposed elsewhere (asrg?) no ref.
sorry. Also, since reputation services have been suggested as being useful
in anti-spam schemes involving marid, it's been suggested that marid can be
reduced to a noop by supplying the peer-IP, MAIL-FROM duple (and anything
else?) to some service providing reputation and/or authorisation. Well,
actually, here MARID is reduced to (at most) a way of discovering the
service.
All very interesting - in scope? I dunno.