pmg-intro.adoc: add Object-Oriented Rule System

diff --git a/pmg-intro.adoc b/pmg-intro.adoc
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@@ -111,6 +111,39 @@ line utilities for on demand file scanning, and an intelligent tool
 for automatic signature updates.
 
 
+Object-Oriented Rule System
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The object-oriented rule system enables custom rules for your
+domains. It’s an easy but very powerful way to define filter rules by
+user, domains, time frame, content type and resulting action. {pmg}
+offers a lot of powerful objects to configure your own custom system.
+
+ACTIONS - objects::
+
+Defines the final actions.
+
+WHO - objects::
+
+Who is the sender or receiver of the e-mail?
+
+WHAT - objects::
+
+What is in the e-mail?
+
+WHEN - objects::
+
+When is the e-mail received by Proxmox Mail Gateway?
+
+Every rule has five categories FROM, TO, WHEN, WHAT and ACTION. Every
+of these categories can contain several objects and a direction (in,
+out or both).
+
+Options range from simple spam and virus filter setups to
+sophisticated, highly customized configurations blocking certain types
+of e-mails and generating notifications.
+
+
 Tracking and Logging
 ~~~~~~~~~~~~~~~~~~~~