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This lets you set whitelists & blacklists for the spam filter.
There are four lists you can manage. The Whitelist Addresses & Blacklist Addresses lists let you specify sender email addresses to check. With the default rule weights, if a sender's address is on the Whitelist, it will be allowed through the spam filter, and if it is on the Blacklist it will be blocked. If an address is on both the Whitelist and the Blacklist, they will cancel each other out, and the message will be treated as if the sender was on neither list.
You can change the rule weights (on Spamfilter -> General → Rule Weights to alter this behaviour (eg you could increase the Whitelist rule weight which would mean that if an address is on both lists, the Whitelist will take precedence).
Note that, by default, local email addresses on the whitelist will be ignored. This is by design, because it is a common spammer trick to pretend to be from a local email address. The CheckLocalWhitelist setting on the spam filter Script Configuration tab can be used to alter this behaviour.
In v6.1 and later you can bulk delete whitelist & blacklist addresses based on conditions you specify. These are detailed below:
All the specified conditions must match for the entry to be deleted. Once you have specified the conditions and pressed 'Delete', VPOP3 will tell you how many entries will be deleted, and will give you some examples of the entries which will be deleted. You can then confirm the deletion. If you find you have made a mistake, you can use the Undo Last Bulk Delete button to undo the latest bulk deletion (this only stores the deleted data for one day or until VPOP3 is restarted, whichever is the sooner).