Kerio Connect - Administrators Guide - Kerio Software Archive

Configuring spam control in Kerio ConnectAntispam methods and tests in Kerio ConnectSpam is an unwanted, usually advertisement email. Kerio Connect includes many options andfeatures to dispose of spam.To detect and eliminate spam, Kerio Connect uses the following methods and tests:• Black/White lists — You can create and use lists of servers and automatically blockor allow all messages they send.Detailed information in this article.• SpamAssassin — SpamAssassin is a famous antispam filter which uses several testingmethods.• Caller ID and SPF — they allow to filter out messages with fake sender addresses.Detailed information in this article.• Greylisting — The greylisting method uses a special server which stores informationabout messages and delivers only messages from the known senders.Detailed information in article Configuring greylisting.• Delayed response to SMTP greeting (Spam Repellent) — Set a delayed SMTP greetingwhich will prevent delivery of messages sent from spam servers.Messages rejected Spam Repellent are not processed by otherantispam and antivirus tests. This decreases the load on your server.• Custom rules — You can create your own rules which will satisfy your needs.Detailed information in this article.Each test can be used separately or combined with the others. To achieve betterefficiency, it is recommended to combine as many antispam features as possible. The moretests are used, the denser is the antispam filter and the less spam will be delivered to user’smailbox. Also the spam detection will be more successful which will reduce number ofmessages marked as spam by mistake (so called “false positives”).115