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--- how_to:whitelist_blacklist [2010/04/30 15:52] – created paul
+++ how_to:whitelist_blacklist [2013/01/11 08:45] – [Spamfilter Whitelist & Blacklist] paul
@@ Line 4: / Line 4: @@
 By default, whenever you send a message, the recipient's address will be added to the whitelist, this is because VPOP3 will assume that the recipient is someone you want to be in contact with. Similarly, if you release a message from the spamfilter quarantine, the sender's address will be added to the whitelist.
+====What the whitelist and blacklist do====
+When an address is found on the whitelist or blacklist, then the spam score is adjusted by 100 x (the relevant [[reference:spamfilter_rule_weights|rule weight]]. With the default settings, this means that an entry on the whitelist has '-10000' added to it, and an entry on the blacklist has '10000' added to it. So, if an entry is in the whitelist AND the blacklist, they will cancel each other out.
+If you wish, you could adjust the rule weights so that one has precedence over the other, eg set the whitelist weight to '-150' to make the whitelist overrule the blacklist, or the blacklist weight to '150' to make the blacklist overrule the whitelist.
 =====Blacklist=====
@@ Line 11: / Line 17: @@
 =====Local Addresses=====
-If you put an address on the whitelist which is also in a 'local domain', then, by default VPOP3 will ignore that. This is because spammers often send spam pretending to be from the same domain as the recipient.
+If you put an address on the whitelist which is also in a 'local domain', then, by default VPOP3 will ignore that when checking //incoming// mail. This is because spammers often send spam pretending to be from the same domain as the recipient. In most cases, mail from local domains will be sent locally, not incoming, so, usually, this is a sensible rule to follow.
-If you want to tell VPOP3 to check the whitelist for local domain email addresses as well, then go to **Settings -> Spamfilter -> General**, go to the **Script Configuration** tab, and set **CheckLocalWhitelist** to **1**.
+If you want to tell VPOP3 to check the whitelist for incoming mail from local domain email addresses as well, then go to **Settings -> Spamfilter -> General**, go to the **Script Configuration** tab, and set **CheckLocalWhitelist** to **1**.
+Note that in many cases, [[allowing_mail_relay_through_vpop3|external users can actually send mail through VPOP3]] as if they were local users, so their mail won't be spam filtered at all.

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