ZyXEL Communications ZYWALL USG 2000 Support Notes page 177

3.3.3.2 Scenario topology
In this example, we consider the SMTP email server is outside the LAN.
3.3.3.3 Steps to configure B/W list
Step 1. Enabling Anti-Spam
First, we activate the function of "Anti-Spam"
ZyWALL > Anti-X > Click Add button
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ZyWALL USG 2000 Support Notes
177