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Over the last 25 years four million e-mail addresses have accumulated in thePGP web of trust. In a study each of them was tested for vitality with theresult of 40% being unreachable. Of the mailboxes proven to be reachable,46.77% turn out to be operated by one of three organizations. In this article,the authors share their results and challenges during the study.

Dead Letters to Alice - Reachability of E-Mail Addresses in the PGP Web of Trust