[mail-vet-discuss] Proposed "header.b" tag for DKIM signatures

SM sm at resistor.net
Thu Mar 25 14:55:04 PDT 2010

Hi Alessandro,
At 12:15 25-03-10, Alessandro Vesely wrote:
>Put it another way, what is A-R going to provide w.r.t. DKIM?
>* Save consumer's cpu time/DNS lookups for signature verification, or
>* provide a synthesis of a message's trustworthiness, according to the
>best knowledge of the filtering agent.

The purpose of A-R is defined in Section 1.1 of RFC 5451.  You are 
assuming that all MUAs can do DNS lookups.  That only works when you 
are online.  A-R can pass the results of the DKIM 
verification.  There are also some scenarios where filtering is not 
done at the boundary.  A-R can communicate the results to the 
downstream filters.


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