ZyXEL Communications 5 Series - Chapter 16 Anti-Spam Screens; Overview; What You Can Do in the Antispam Screens; Figure 182 Anti-Spam Overview

ZyWALL 5/35/70 Series User’s Guide
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CHAPTER 16
Anti-Spam Screens
16.1 Overview
The ZyWALL’s anti-spam feature identifies unsolicited commercial or junk e-mail (spam).
You can set the ZyWALL to mark or discard spam. The ZyWALL can use an anti-spam
external database to help identify spam. Use the whitelist to identify legitimate e-mail. Use the
blacklist to identify spam e-mail.
The following is an figure showing the ZyWALL checking e-mail with the external database.
Figure 182 Anti-spam Overview
1 E-mail comes into the ZyWALL from an e-mail server (A in the figure).
2 The ZyWALL calculates a digest of the e-mail and sends it to the anti-spam external
database.
3 The anti-spam external database calculates a spam score for the e-mail and sends the
score back to the ZyWALL.
4 The ZyWALL forwards the e-mail if the spam score is at or below the ZyWALL’s spam
threshold. If the spam score is higher than the spam threshold, the ZyWALL takes the
action that you configured for dealing with spam.
16.1.1 What You Can Do in the Antispam Screens
• Use the General screen (Section 16.2 on page 315) to configure interfaces to scan for
spam mail and actions to be taken when spam is identified.
• Use the External DB screen (Section 16.3 on page 318) to enable or disable external
database services and configure the spam threshold.
• Use the Anti-Spam Lists screen (Section 16.4 on page 320) to configure whitelist and
blacklist settings.