sbl-xbl.spamhaus.org 32 hits bl.spamcop.net 78 hits list.dsbl.org 33 hits dnsbl.ahbl.org 34 hits dnsbl.njabl.org 1 hit (for the entire 24 hr. period) opm.blitzed.org 1 hit (for the entire 24 hr. period) relays.ordb.org 1 hit (for the entire 24 hr. period) multihop.dsbl.org 15 hits
I then picked another day at random (the following Monday) to check that log
sbl-xbl.spamhaus.org 42 hits bl.spamcop.net 78 hits list.dsbl.org 46 hits dnsbl.ahbl.org 28 hits dnsbl.njabl.org 12 hit (during the first 6 hours) opm.blitzed.org 0 hits for the entire 24 hr. period) relays.ordb.org 0 hits (for the entire 24 hr. period) multihop.dsbl.org 3 hits
Since we automatically delete a message if it is found to have come from a server listed on any two of the above spam databases I can't say that
dnsbl.njabl.org opm.blitzed.org relays.ordb.org multihop.dsbl.org
would not have identified more pieces of spam than they did, however I think I am safe turning off the server from checking those last four databases since it appears that the first four are taking care of the VAST majority of identified spam. Not checking those four additional databases should also help with speeding up local mail delivery since it IMail checks in serial.
Of course, YMMV
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