By chance, I found out that my blog had been blacklisted by Quttera. No big deal, because it happens from time-to-time due to the nature of the content on the site. But I discovered that it isn't just my blog, but Quttera also block industry-leading sites such as Cisco, VMWare, Sophos, MITRE, AVG and Phishtank.
more here.......http://blog.dynamoo.com/2015/03/quttera-fails-and-spews-false-positives.html
more here.......http://blog.dynamoo.com/2015/03/quttera-fails-and-spews-false-positives.html