[exim-dev] content scan results cache

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Autor: Tony Finch
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A: Tom Kistner
CC: exim-dev
Assumpte: [exim-dev] content scan results cache
MailScanner has gained an interesting optimization recently, that may be
worth adding to Exim. It takes a checksum of the message body, and if that
matches the checksum of a message that has already been received it skips
the full SpamAssassin and anti-virus scan and instead pulls the results
out of a cache. This seems to be more effective than you might expect,
even without any kind of fuzzy-matching in the checksum.

Tony.
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