qydlqcwsiacfymissuesapacheorg httpissuesapacheorgspamassassinshow_bugcgiid5820 additional comments ociwusurblorg 20080211 0034 zen probably used application arguably xbl sbl specifically list spam spoort spaces dns www mx etc servers xbl list compromised hosts mostly botnets mostly senders though fast flux web hosting also pbl list spaces spamhaus believes isps specify emitting mail could host legitimate nameservers web servers etc pbl anything mailservers zen combination sbl xbl pbl single list sbl correct list use test pbl though zen could fp legitimate nameservers legitimate web servers etc httpwwwspamhausorgpblindexlasso policy block list spamhaus pbl dnsbl database enduser ip address ranges delivering unauthenticated smtp email internet mail server except provided specifically isp customers use pbl lists dynamic static ips ip policy whether block owners interim absence spamhaus policy sending email directly mx servers third parties use pbl filters deep parsing received headers checking ip addresses hand mailservers receiving mail assignee bug watching assignee tue 05 aug 2008 172051 0800 bug 5820 uribl_sbl zen