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Not with the this! This is a automatic heuristic system.
You want to use the manual whitelist/blacklist. See ManualWhitelist.

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TODO: verify example calculation, verify auto_whitelist_factor and show default, upload sa-awlUtil. .

Most other products use an AutoWhitelist as automation of a manual whitelist, which is created and/or maintained by monitoring outgoing email to add entries to a whitelist without a need for human intervention. In essence, rather than adjusting a sender's average score, as in SpamAssassin, most other products literally automate the addition of names to the manual whitelist. Because autowhitelist-ing is an industry standard term for automation of a whitelist, this feature in SpamAssassin should be re-named to better align with what it actual does, such as maybe AutoReScore? In essence, be aware the term AutoWhitelist means something else on most (if not all) other anti-spam products. – JDR

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From http://wiki.apache.org/spamassassin/ManualWhitelist "the name is a misnomer. The AutoWhitelist is designed as an automatic score averaging system." Maybe score averaging system? -Roger

It seems to me that this would be the place to document the default value of auto_whitelist_factor. I gather from other sources that it's 0.5. – DanielNorton