> Is it possible to use reject_unknown_reverse_client_hostname-like > feature as part of scoring with blacklist checking? I think > policyd-weight supported that. I consider using postfwd.
Yes this is possible with postfwd. The policy delegation protocol contains reverse_client_name and client_name, which can be used within postfwd rulesets. Example: id=COMBO01 reverse_client_name==unknown rbl=bl.spamcop.net,pbl.spamhaus.org action=REJECT due to no valid rDNS and blacklisting