No option to block and frankly eHam does not care. I wrote an article on amplifiers a few years back and received perhaps 15 posts of abuse from an Australian Ham that I was mentally ill, retarded and a dozen other unbelievable comments from this very ill Ham. eHam just let the abuse continue. Also, Carl KM1H teamed up with the Australian Ham with his negative comments. Article was about inexpensive HF amplifiers, nothing controversial, nothing to dispute. Unbelievable.