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Mail rules

The website says:
Some low level rule checks you can set are: 
 By reverse name lookups 
 By double DNS verification 
 By forcing MAILFROM 
 By validating MAILFROM 
 By validating connection IP 
 By Blacklists 
 By WhiteLists 
 By Domain Extension requirements 
 By country of Connecting IP 
 By country of MAILFROM 
 By syntax 
 By checking HELO signatures 
 By Language 

Where can I get a sample file showing how to implement these rules?
--
Scott G. Carpenter
Xtreme Network Services
www.XtremeNS.com