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: