Administrator's Guide - Kerio Software Archive

Chapter 16 Antispam control of the SMTP serverFigure 16.2Blacklists tabTo create a whitelist, a new IP group must be defined. To define a new IP group, click Edit.This opens a dialog, where a custom IP group of SMTP servers (or users) can be created.Note: All IP ranges reserved for private networks are added to the whitelist automatically.127.0.0.110.0.0.0/8172.16.0.0/12192.168.0.0/16This applies to the following IP ranges: However, all IP addresses, though included in thewhitelist, are verified in the blacklist (Custom blacklist of spammer IP addresses). Thismay be helpful when it is necessary to block any of these addresses.Custom blacklist of spammer IP addressesIn this section, it is possible to define a custom group of IP addresses of SMTP servers (orusers) known as spammers. Click Edit to edit the selected group or to create a new one.Any messages sent from any SMTP server included in the blacklist can be blocked or itsspam rating value can be increased:• Block the messageThe message will be blocked on the SMTP level and the sender will be informed thatthe message cannot be delivered.• Add this value to the message’s spam score:Set spam score will be added to the message’s score.In case of blacklist, the recommended score value is from 1 to 4 points.174