ZyWALL 35 Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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I06. In ZyWALL’s Anti-Spam feature, what’s your recommendation to handle identified
spam emails?
1. There two actions ZyWALL can take against identified spam emails: to block or to tag.
2. Pros and Cons
If you choose to block them, then you have no control over false-positives.
If you choose to tag them, then you still have the spam email traffic on your mail server and everybody
has to set a rule in outlook to filter the spam emails into a dedicated folder.
3. Recommendation
Most IT managers choose “tag” spam emails, which is also our recommendation although
ZyWALL/Mailshell Anti-Spam technology performs very low false-positive.
I07. What’s the specification of Anti-Spam feature in ZyNOS v4.01?
Specifications of Anti-Spam feature
Supported protocols
POP3 and SMTP protocol
Action on spam emails
For Pop3, it can “tag” the spam email;
For SMTP, it can do “tag” and “block”.
Default Setting
Enable Tag with [SPAM]/[PHISHING] subject
Maximum concurrent sessions
ZyWALL 5: 5
ZyWALL 35: 15
ZyWALL 70: 30
I08. How do I keep signatures of Anti-Spam service update?
From the current design, there is no local spam signature database maintained on the ZyWALL UTM
devices. As a result, you don’t have to update the AS signature for the device. The transactions and
queries between AS-enabled ZyWALL devices and our rating server are taking place dynamically and
automatically in the background.
However, you may want to maintain your own black list/white list on device to maximize the
effectiveness of the Anti-Spam security service.
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