diberry - 3:21 pm on May 18, 2013 (gmt 0)
Kumar89, have you checked to make sure none of these guest posts also got posted elsewhere, creating dupe content issues? Or looking like a link network?
I hope Google isn't treating all guest posts as unnatural links, because that's pretty draconian. Guest posts can be of high quality, with an author's link to a site that your readers may be thrilled to discover.