whitelist syntax

Hello,
I'm back to postfilter fine tuning and I wonder what is the syntax of 
the access.conf postfilter file for whitelisting

for example, I see in the file the line:

#                        "NNTP-Posting-Host",    "46.165.242.91"

but there is no "NNTP-Posting-Host" header on messages source, only 
posting-host="cu...". What is allowed in the left part of the line?

on the "Path" header, IP is written in reverse order. I see in one of 
the aioe post the IP "46.165.242.75", so if I filter by IP, do I have to 
use direct or reverse IP notation?

thanks
jdd
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