Bill Cole said:
The postscreen DNSBL configuration should be designed to only block IPs that *only* send spam.
So why, I like to ask is fqrdns list not recommended for use in postscreen?
https://github.com/stevejenkins/hardwarefreak.com-fqrdns.pcreIts maintained by same person as postwhite so I guess that means he knows good reason why not to outright blacklist the clients in that list.