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Blacklist redundancy

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From www.spamhaus.org:

The XBL wholly incorporates data from two highly-trusted DNSBLs, the CBL (Composite Block List) from cbl.abuseat.org, and the Blitzed Open Proxy Monitor from opm.blitzed.org, therefore mail servers already using cbl.abuseat.org and opm.blitzed.org should NOT also use xbl.spamhaus.org or you will be making 'double' queries to basically the same data source and only one DNSBL will appear to work, the other(s) will appear to not catch anything.

Contrary to this advice, the SpamCop options allow checking BOTH cbl.abuseat.org and xbl.spamhaus.org. The selection should be exclusive.

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From www.spamhaus.org:

The XBL wholly incorporates data from two highly-trusted DNSBLs, the CBL (Composite Block List) from cbl.abuseat.org, and the Blitzed Open Proxy Monitor from opm.blitzed.org, therefore mail servers already using cbl.abuseat.org and opm.blitzed.org should NOT also use xbl.spamhaus.org or you will be making 'double' queries to basically the same data source and only one DNSBL will appear to work, the other(s) will appear to not catch anything.

Contrary to this advice, the SpamCop options allow checking BOTH cbl.abuseat.org and xbl.spamhaus.org. The selection should be exclusive.

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Although it is rare, there have been times that a new listing hasn't propagated through all the lists yet.

I had a spam that was blocked by cbl, but not by xbl.

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