and given the weakness of the Reverse DNS access for security purposes, what 
problem is this draft trying to solve? If we need to find the host that has 
sent an email associated with an address, would we better let DKIM address that 
without a separate lookup in the receiving server? DKIM detects email spoofing 
by using digital signature allowing receiving mail exchangers to check that 
incoming mail from a domain is authorized by that domain's administrators. 

Is there a better way to approach the problem?

I do not claim it is a best way but I think CGA-TSIG can easily handle many 
similar scenarios.
You can check the old version here
http://datatracker.ietf.org/doc/draft-rafiee-intarea-cga-tsig/
and upcoming version here
<http://editor.rozanak.com/show.aspx?u=AZCDD03D4DBABD14DA80CDTAM  >

Hosnieh

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