The "Virus Bounce Ruleset" is a SpamAssassin ruleset to catch "backscatter".
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Backscatter is mail you didn't ask to receive, generated by legitimate, non-spam-sending systems in response to spam. Here are some examples, \[http://www.spamresource.com/2007/02/backscatter-what-is-it-how-do-i-stop-it.html courtesy of Al Iverson\]: |
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