There's a rather serious problem with the check_rbl logic to trim down
the Received IP list to something manageable and that is that it doesn't
first exclude reserved IPs before trimming.  I'm quite commonly seeing
spam now that passes around through a couple of internal hosts with
reserved IPs before hitting the net at large.  When check_rbl gets ahold
of it it trims off only the last 2 hosts which having reserved IPs don't
get checked at all since there is some logic to skip the check
altogether for reserved IPs.  Bad bad.

Ken Causey





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