I like this.  I have been using the word "stronger" to describe what 
you're calling "exclusive", but I can change my habits.
-Jim
Hector Santos wrote:
It is possible to have same english terms assigned the outbound signing
policy tags?
Just ideas:
o=~ NEUTRAL or RELAXED (signature optional [,No 3rd party?])
o=-  STRONG  (signature required, 3rd party allowed)
o=!  EXCLUSIVE (signature required, no 3rd party)
o=.  NEVER  (no mail expected)
o=^  USER
It is easier to converse with someone that a domain has a "relaxed or
neutral DKIM" policy" as opposed to a "o=~ DKIM policy"
--
Hector Santos, Santronics Software, Inc.
http://www.santronics.com