I'm having luck looking up the name servers of the sending host to see
if it's blacklisted
set acl_c_ns = ${lookup
dnsdb{>;ns=$acl_c_sender_host_domain}{$value}fail}
dnslists=hostkarma.junkemailfilter.com=127.0.0.2/<;$acl_c_ns
In this case $acl_c_sender_host_domain is the registry barrier pary of
the host name (ie example.com)
Anyhow - my point - it's catching a lot of spam especially from new
domains just registered. Something worth exploring.
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