Administrator's Guide - Kerio Software Archive

16.7 Recommended configuration of antispam testsmessage really is a spam since the message is evaluated by multiple tests and otherpoints would be added to the score.3. Internet blacklists — check all databases available. Use the Edit button to open individualdatabases and set spam score to 2 points (see figure 16.4).Recommendation: Do not set message blocking for Internet blacklists, especially for thefree ones. These databases may be updated quite rarely or slowly and the informationinvolved might be unreliable. The lists might include non-spammer servers. Therefore,use these databases better to add spam score to suspicious messages.Custom RulesAnother test for incoming email is a set of custom rules (for details, see section 16.3). Customrules can be created as needed:1. Define corresponding rules for SMTP servers. If possible, set addition of only two or threepoints for all spam rules. Since there are multiple rules defined, each test adds a score ifthe message is considered a spam.2. If there is a rule which blocks spam messages, set an address where copies of blockedmessages will be sent (see figure 16.11). The best way to do it is to create a special usermailbox (for detailed information on creating of user accounts, refer to chapter 13).Figure 16.11Forward the message to quarantine addressSpamAssassinIt is not necessary to apply any special settings to the SpamAssassin filter. Any definitions ofthe filter may be done on the SpamAssassin tab (for details, see section 16.4).The only setting that needs to be changed on the tab is enabling of the Check every incomingmessage in Spam URI Realtime Blocklist (SURBL) database option.Caller ID tabTo read more on the Caller ID technology, see chapter 16.5. If you decide to use this technology,it is strongly recommended to set the tab as follows:1. Open the Caller ID tab under Configuration → Content Filtering → Spam Filter).2. Enable the Check Caller ID of every incoming message option.191