A substantial number of permission-based emails continue to be redirected to the digital dead letter office by the overly aggressive filters of Internet Service Providers (ISPs), according to Return Path’s semi-annual “Email Blocking and Filtering Report.”
The report shows that among the top 18 ISPs, NetZero and Yahoo!’s SBC Global ISP product were the worst offenders, blocking 37.7 percent and 26.7 percent of permission-based emails, respectively. EarthLink and Bell South had the lowest non-delivery rates, at 7 percent and 8 percent, respectively.
Download the report here
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