It appears that MCN-IETF <[email protected]> said:
>So is the expectation that null recipes should effectively only be accepted 
>from signers
>explicitly configured as trusted by the receiving ADMD, or could there perhaps 
>be a mechanism
>for establishing that authorization? 

The former--the signer is explicitly configured, generally because there's a 
business
relationship with the signer which is doing inbound spam and malware filtering.

It's hard to think of a plausible way to establish it without some sort of 
manual verification
that you trust the system that is smashing your mail.

R's,
John


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