I was specifically talking about querying a DNSBL with possible-forged IP
addresses, not creating new listings or anything else.
That wasn't clear.
Anyway, you normally only look up the IP of the gateway host that sent the
mail from their network to yours. Relays before that are often from hosts
on dialup lists like the PBL, which is fine for intra-network relays, and
means you'll mark legit mail as spam.
Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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