Administrator's Guide - Kerio Software Archive

Chapter 16 Antispam control of the SMTP serverFigure 16.4 Database parametersAdd spam score to the messageThe value set here will be added to any message accepted from any server includedin the blacklist.In case of this blacklist, the recommended score value is from 1 to 3 points. Thevalue of the score added depends on level of trustworthiness of a particular database.Generally, paid spammer databases examines more thoroughly SMTP serversto find out whether they really are spam senders or not. Therefore, if you use paiddatabases, it is possible and even more efficient to set higher scores than in case offree databases. This is, however, only a general knowledge which cannot be appliedwithout exceptions. If you are familiar with a free database and you are sure that itwould be efficient, you can set higher scores for them as well.If you combine multiple spammer databases, set lower spam scores since individualSMTP servers may be included in multiple databases and their scores are summed.Ask the blacklist DNS servers...using of this option is recommended in cases where Kerio MailServer uses a paidspammer database where the license is associated with a particular IP address.Queries are sent directly to the database, parent DNS servers will not be used forthe delivery.Note: Any time a delivered message is sent from an address which matches a blacklistitem, the information is recorded in the Security log (for details, see chapter 22.4).Therefore, to test reliability of a new blacklist, include it to the list and set the Add spamscore to the message option to 0. Email will not be affected and each message matchingwith the blacklist will be listed in the Security log.Supported databasesSpamCopKerio MailServer supports SpamCop, a database of spammer IP addresses.information on SpamCop, refer to http://www.spamcop.net/For more176