The filter allows you to whitelist individual addresses and entire domains with ease. You can set the filter send you a report listing all emails that have been put into the junkmail folder in a specified time period. I've been using the system for over a year, across half-a-dozen domains, and I am aware of only 1 legitimate email that it accidentally trapped. By comparison, I've been using Gmail for 6 months, and it has already caught two legitimate emails as spam.
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