Starting from build 2.1.1.367 we've added the following feature:

// New to VersionNumber = '2.1.1.367';

{TODO -cNew : Added option so that any quarantined (false positives) emails that the end user force-delivers will cause the sender to be automatically whitelisted}

From the readme.html http://file:

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Starting from SpamFilter ISP v 2.1, when an end user forces the delivery of a quarantined email to his mailbox, the sender of that email will be whitelisted so that the number of false-positives (good emails wrongly classified as spam) is reduced. The list of user-created entries is stored in the file AutoWhiteListForceDelivery.txt. The whitelisting is on a per-user basis, meaning that a sender is whitelisted only when he sends emails to that specific recipient. This will prevent a user mistakenly whitelisting a spammer, who could then send spam to all of your users.
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Hope this helps!

Roberto F.
LogSat Software