PLANET CS-2001 - Manual (Page 446)

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Step 2. Go to Mail Security > Configuration > Mail Relay and then set as below:
（Figure 12-35）
 Select Sender’s IP Address.
 Type the IP Address and the Netmask.
 Click OK.
Figure 12-35 Mail Relay Settings
Note：
1. In this example, the Mail Relay setting is used for determining the emails sent from the mail
server under DMZ1.
 If the recipient is an internal user (supportplanet.com.tw), the email will be recorded
under Mail Security > Mail Reports > Logs > Inbound SMTP after filtering.
 If the recipient is an external user, the email will be recorded under Mail Security > Mail
Reports > Logs > Outbound SMTP after filtering.
2. Given that a valid internal account sends an email to the extenal recipient upon the activation
of SMTP authentication, then there is no need to configure the Sender’s IP Address under
Mail Security > Configuration > Mail Relay.