PLANET CS-2001 - Manual (Page 448)

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Step 2. Go to Mail Security > Configuration > Mail Relay and then set as
below:
 Click New Entry.
（Figure 12-37）
 Select Sender’s IP Address.
 Type the IP Address and the Netmask.
 Click OK.
 Click New Entry again.
（Figure 12-38）
 Select Sender’s IP Address.
 Enter the IP Address and the Netmask.
 Click OK.
Figure 12-37 The First Entry of Mail Relay
Figure 12-38 The Second Entry of Mail Relay