One of the biggest spam block lists on the internet suffered an embarrassing technical cock-up today which blocked emails from some servers at web security monitoring firm MessageLabs and at some ISPs for about five hours.The CBL (Composite Blocking List), a DNS blacklist that takes its source data from very large spamtraps and lists IP addresses of open proxies and worms/viruses, said on its website that a problem in a contributory feed spat out a number of invalid lists.The rogue feed has now been removed and all IP addresses on the blacklist have been purged as a precautionary measure.
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