![]() ![]() The vast majority of research on spam has focused on helping the recipients of spam avoid receiving it (to cite a few). Stopping Outgoing Spam Joshua Goodman Robert Rounthwaite Microsoft Anti-Spam Technology and Strategy Group One Microsoft Way Redmond, WA 98052 Microsoft Research One Microsoft Way Redmond, WA 98052 year. One now well known technique to help stop outgoing spam, rst used at Yahoo and now used at Hotmail, is to require users to solve a simple test (a so-called reverse Turing test) to prove that they are human. ESPs want to stop outgoing spam to lessen the load on their own servers, to prevent their systems from being blocked from sending mail, and to avoid bad publicity. ![]() Stopping outbound spam at ESPs will not prevent all outgoing spam, as many spammers own direct internet connectivity and cannot be forced to adopt these techniques, but it will stop a substantial source of spam. We instead focus on helping Email Service Providers (ESPs) prevent their users from sending spam. Stopping outgoing spam Stopping outgoing spam
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