http://www.msexchange.org/tutorials/Transport-Rules-Exchange-Server-2007.html
This scenario is called Ethical Wall, because we can protect the message flow between users and groups based on transport rules
To create our first rule, we will need to click on Hub Transport expanding the Organization Configuration node in the left pane of the Exchange Management Console, then click on the Transport Rules Tab and finally clicking on New Transport Rule on the Action Pane, as can be seen in Figure 2 below.
Figure 2: Creating a transport rule on the Exchange Management Console
In the New Transport Rule Wizard, we should fill out the Name and Description and make sure that ‘Enable Rule’ is selected. After that click Next. (Figure 3)
Figure 3: Wizard welcome screen to create transport rules
Conditions: We can define from who or to a message is going, based on string or message fields or some address inside the fields (To:, From: or Cc). In this example mark From People and you can see in Step 2 the construction of the rule, like the Rules and Alerts in Outlook.
During step 2 click on the ‘people’ link to select the users for this rule. (Figure 4)
Figure 4: Conditions – Specifying “from people” on the transport rule
In the new window, we can choose the users that will be affected by this rule, click Add, select user(s) and click OK. The result is shown in the figure below, Figure 5.
Figure 5: Selection of users in the “From People” condition
We’ve just selected the user Anderson Patricio in the “from people” condition. After that, we will need to tick “sent to people” and select the “target” user for this rule. In this case, we will choose John Rodas and select him as we did in the previous example. (Figure 6)
Note:
When we have more than one item ticked in conditions, we have a logical 'AND', so it means that the transport rule will be processed only if all the conditions are valid. If not, the rule will not be executed.
Figure 6: Conditions - Our condition has been established
In the New Transport Rule Wizard page, tick “send bounce message to sender” as shown in Figure 7. With this option selected, when a user (in this example, Anderson Patricio) sends a message to the selected user (in this example John Rodas), the sender (Anderson) will receive a predefined bounce message. (Figure 8)
Figure 7: Actions - Defining an Action to conditions specified before
To customize the message that will be displayed in the return message, we will need to click the link “Delivery not authorized, message refused” in Step 2 and then customize the content for the bounce message. (Figure 8)
Figure 8: Editing the text of action “send bounce message to sender”
Now, we have completed the Conditions and Actions; it can be reviewed in Figure 9.
Figure 9: The conditions and actions phases have been done, click Next
Exceptions: In this case all messages from Anderson Patricio to John Rodas will be blocked, except those e-mail messages including the words Personal and Life in the subject. To do so, tick “except if with specific words in the subject” and then click on the link in Step 2 and add your exception words on the next screen. After that, we can see the result of configured Exception (Figure 10).
Figure 10: Exceptions – Defining the exceptions in the Transport Rule
On this page, we can review the configured options in the wizard, as shown in Figure 11. We must click Create.
Figure 11: Configuration Summary on New Transport Rule Wizard
The below shows the final screenshot for the rule creation wizard using a cmdlet. With a cmdlet we can create the same rule using the Windows PowerShell Console or a wsh administrative script. Click Finish. (Figure 12)
Figure 12: Final screen showing the cmdlet used to create this rule.
After clicking on the Finish button, the rules will show up on the Exchange Management Console.
We can select the rule and all the possible actions are also enabled in Action Panel. There are now some actions to assign to this rule: Disable rule, Edit and Remove. (Figure 13)
Figure 13: Visualizing the created rule
Ok, it’s done! Now we will see the résumé of our transport rule:
Name
Blocking suspicious messages from Anderson Patricio to John Rodas
Condition
From Anderson Patricio AND To John Rodas
Action
Send bounce message
Except
except if word personal or life in subject
Let’s test the configured rule!
The first test is to send an email from Anderson Patricio to John Rodas (Figure 14).
Figure 14: User Anderson Patricio is writing to John Rodas about some important information
Our rule will block this kind of email message, and the sender (Anderson Patricio) will get a pre-defined action “set bounce message to sender” (Figure 15). If the sender receives the message below, our Condition and Action configuration is working.
Figure 15: Sender receives the message with the Action of the rule. Pay attention to the message, it has our modification (by MsExchange.org administrator)
The second test is to validate the rule about exceptions. The sender (Anderson Patricio) is going to send another e-mail message but it will have the word Personal in the subject of the message. (Figure 16)
Figure 16: Sending a message to validate Exception
This email has an allowed word in the subject, so the receiver (John Rodas) got the message. We can now validate all the phases of the rule (Conditions, Actions and Exceptions). (Figure 17)
Figure 17: The allowed message is received by user
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