adding rDNS check feature to OpenSMTPD

[Seth]

I'm searching for additional ways to combat spam and looking into using  
reverse DNS lookups as a tool for doing so.

What do others think of using rDNS lookups as an anti-spam tactic?
If rDNS lookups are worthwhile, where would the most appropriate place to  
implement them be; spamd or the OpenSMTPD daemon?

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