Letter: Spamhaus Responds on Yahoo Incident
Then they ignored the SBL warnings. Then they ignored the notice of blacklisting. Yahoo managers repeatedly told the management of Yahoo Store that they risked being blacklisted, but Yahoo Store's management even ignored advice from within Yahoo Inc. Spamhaus does not go around blacklisting anything lightly. We first attempt every alternative means to stop the network abuse, more so in cases where large concerns such as Yahoo are involved.
Steve Linford, Director, The Spamhaus Project, London