ZyXEL 35 Guia Do Utilizador

ZyWALL 35 Support Notes

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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.