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Just-In-Time Filtering (2)
If you don't have cross-site high-bandwidth minefielding connections, you need to filter TWICE:
First filter – SMTP time - Reject anything that you are sure is a spam.
Second filter – user-read time - When a user actually is pulling email from the spool, filter again.
This delay allows the greatest possible time window for Inoculations and minefield messages to arrive.