Invaluement is a DNSBL created by Rob McEwen, owner of a sole proprietorship called PowerView Systems. (technically, Rob McEwen, d.b.a. “PowerView Systems”). PowerView Systems was started in 1996 and began as a web site design and computer programming business specializing in creating data-driven real estate and ecommerce web sites. We had already managed mail servers since the mid-90s as a part of our web design business. Then, around 2004, we shifted our focus to our email hosting and spam filtering services. Meanwhile, Rob McEwen was active as a volunteer for the SURBL blacklist (especially ...


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