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I have a huge fear that I am beating a dead horse down a rathole. I  
also fear that I no longer understand what's being discussed.  
However, I want to make a cryptographic observation.

If you create a suitably-sized RSA key, throw away the private key,  
and put the public key in a DKIM selector, you have made a selector  
that can't have mail signed from it (or if you want to be really  
anal, forging a signature for that selector is equivalent to breaking  
that key).

If you then say, "I sign all mail" for any domain pointing to that  
selector, you've effectively made a cryptographically enforced no- 
mail, no-use, etc. domain using the existing Tinkertoys.

In short -- saying "I sign everything" with a non-existent or bogus  
key is the same thing as saying, "You'll never see a valid one of  
these."

        Jon


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