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+ - Fingerprinting the World's Mail Servers

ttul writes: "This O'Reilly SysAdmin Article describes some work done by mod_perl author Stas Bekman and his colleagues at anti-spam software company MailChannels to fingerprint the world's publicly visible email servers. Interesting results from the survey? Open source options like Sendmail and Postfix are still firmly in the lead after all these years, but commercial services like Postini are catching up fast. The article goes into some detail on how email servers can be fingerprinted despite attempts by sysadmins to cloak their identity."

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