Hector Santos wrote:
 
>>>>> "!  All mail from the entity is signed; Third-Party
>>>>>     signatures SHOULD NOT be accepted in lieu of an
>>>>>     entity signature

>>    Yes, that's what it's supposed to mean.
 
> So in other words, for the EXCLUSIVE (o=!) policy.
 
>     DO NOT ACCEPT IF AN OA SIGNATURE IS MISSING.
>     DO NOT ACCEPT IF A 3RD PARTY SIGNATURE IS PRESENT.

Only the first DO NOT.  The second DO NOT is unnecessary and
potentially harmful.  What if the author is forced to send
via a route where a 3rd party routinely adds its signature
without caring about SSP ?  

What if the receiver forwards his mail to another MRN, and
his clueless forwarder always adds a 3rd party signature ?

The important point is the first DO NOT. the second would at
best save you (as the checking receiver) a few lines of code.

                               Bye, Frank


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