ZyXEL Communications ZyXEL ZyWALL USG-1000, User Manual

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Chapter 35 Anti-Spam
ZyWALL USG 2000 User’s Guide
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For the best anti-spam performance, use only the most accurate DNSBLs that you
can. Adding other (less accurate) DNSBL domains can decrease the anti-spam
performance. Some DNSBLs are more effective than others. You want the DNSBLs
that catch as much spam as possible while avoiding false positives (identifying
legitimate e-mail as spam). Different DNSBLs also have different usage policies.
For example, you can check http://www.spamhaus.org or https://www.sorbs.net
for more information.
Figure 396 Anti-X > Anti-Spam > DNSBL > Add
The following table describes the labels in this screen.
35.7 The Anti-Spam Status Screen
Click Anti-X > Anti-Spam > Status to display the Anti-Spam Status screen.
Use the Anti-Spam Status screen to see how many e-mail sessions the anti-
spam feature is scanning and statistics for the DNSBLs.
Figure 397 Anti-X > Anti-Spam > Status
Table 174 Anti-X > Anti-Spam > DNSBL > Add
LABEL DESCRIPTION
General Settings
Enable DNSBL
Domain
Select this check box to have the ZyWALL check the sender and relay
IP addresses in e-mails against this DNSBL.
DNSBL Domain Enter the domain that is maintaining a DNSBL.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving your changes.