PLANET CS-2001 - Manual (Page 229)

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Step 4. Go to
Policy Object > Service > Group, and create a group called
Main_Service containing all of the server’s services e.g. DNS, FTP, HTTP,
POP3, SMTP, etc. Create another group called Mail_Service comprising the
services for enabling the server to send emails. （Figure 10-3）
Figure 10-3 Group Settings
Step 5. Under
Policy > Incoming, set as below: (Figure 10-4)
 Select the defined mapped IP for Destination IP.
 Select Mail_Service for Service.
 Click OK.
（Figure 10-5）
Figure 10-4 Configuring the Incoming Policy
Figure 10-5 The Completed Policy Settings