A massive 300Gbps was thrown against Spamhaus’ website but the anti-spam organisation was able to recover from the attack and get its core services back up and running. CloudFlare, the content delivery firm hired by Spamhaus last week to guard against an earlier run of DDoS attacks, was also hit, forcing it into taking the highly unusual step of dropping London as a hub in its network – as a Twitter update by CloudFlare on Monday explained. The blacklists supplied by the not-for-profit organisation are used by ISPs, large corporations and spam filtering vendors to block the worst sources of junk mail before other spam filtering measures are brought into play. Spamhaus turned to CloudFlare for help and the content delivery firm was able to mitigate attacks that reached a peak of 75Gbps, as explained in a blog post here.