PLANET CS-2000 - Manual (Page 338)

CS-2000 UTM Content Security Gateway User’s Manual
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7.2.1 Setting
Spam Setting
„ Can make the inbound and outbound mail inspection.
„ If the mails has over the threshold score, then add the message or select to add the score tag to the
subject line. If the mails have not over the threshold score, then the MIS engineer can only add the score
tag to the subject line.
„ We can use the many methods to distinguish if the mails are spam mails in the CS-2000 ：
‹ Check spam fingerprint：To compare the mail’s ID (after calculated) to the mail server’s spam mail
ID list.
‹ Enable Bayesian filtering：Bayesian filtering can compare the mail header item to the training
database filtering rules.
‹ Spam signature push update：To compare the mail algorithm values to the mail classification
values in server database.
‹ Check sender account：To send the check packets to sender account.
‹ Check sender IP address in RBL：To compare the sender IP to the blacklist in mail server.
„ When adjust the spam mail scanning options, the CS-2000 can compare the priority of Personal Rule
and Global Rule.
The CS-2000 will use the default rules to scan the mails if the MIS engineer did not select any spam mail
action.
The Bayesian filtering works until training database has at least 200 spams and 200 hams.
The amount mail in Bayesian training database