> I want to do this because there are some senders who are vulnerable to > phishing or forgery but still don't bother to use SPF or DKIM. I can work out > who they use as outbound servers through by learning from traffic patterns, > and I want to give some SA credit when they're sending through known servers.
The dnswl.org <http://dnswl.org/> rules should cover that. If the IPs are not listed, we’d gladly add them. — Matthias
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