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Why doesn't SpamAssassin default to not trusting any hosts?

Well, trusting two too few is in many ways just as bad as trusting too many. Many SpamAssassin rules try to perform checks against the untrusted host that delivered mail to the first trusted server. If there's too few or too many hosts that SA trusts, these tests will be examining the wrong host. Both situations contribute greatly to false negative problems, and to a lesser extent false positive problems.

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