A message processing rule (hereinafter also "the rule") is a specific multitude of pairs of addresses of senders and recipients whose email messages are processed by Kaspersky Secure Mail Gateway by applying the same values of settings. For a rule to be assigned to an email message, the addresses of the sender and recipient must be specified in the rule settings.
By default, the program contains the following preset message processing rules:
When processing an email message, Kaspersky Secure Mail Gateway applies rules according to their order in the table from top to bottom, regardless of the sequence number of a rule ID. If the combination of sender-recipient addresses does not match, the program proceeds to the next rule. As soon as it finds the sender-recipient pair of addresses in any rule, the program applies the processing settings configured in that rule to the message, and the search for a match is finished.
If none of the rules contains the "sender - recipient" pair of addresses, the message is processed in accordance with the preset settings of the Default rule.
If the message has a DKIM signature, it may be damaged if applied processing rules modify the subject or body of the message, delete attachments, disinfect detected malicious objects, add disclaimers to the body of the message.
For each rule, you can specify your own settings for processing email messages.