PLANET CS-2001 - Manual (Page 501)

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Step 6. Under Mail Security > Configuration > Mail Domains, set as below:
（Figure 13-36）
Figure 13-36 Mail Domain Settings
Step 7. Under Mail Security > Configuration > Mail Relay, set as below:
（Figure
13-37）
Figure 13-37 Mail Relay Settings
Note:
1. Mail Relay relays emails that sent to a specific domain to the destination mail server. It also
allows external users to send emails via internal email accounts.