ZyXEL Communications 5 Series User Manual

 Chapter 16 Anti-Spam Screens

ZyWALL 5/35/70 Series User’s Guide

Figure 184   SECURITY > ANTI-SPAM > External DB

The following table describes the labels in this screen. 

Table 89   SECURITY > ANTI-SPAM > External DB

External Database

Enable External 
Database

Enable the anti-spam external database feature to have the ZyWALL 
calculate a digest of an e-mail and send it to an anti-spam external database.
The anti-spam external database sends a spam score for the e-mail back to 
the ZyWALL.

Spam Threshold

The anti-spam external database checks an e-mail’s digest and sends back a 
score that rates how likely the e-mail is to be spam. The possible range for the 
spam score is 0~100. The closer the score is to 100, the more likely the e-
mail is to be spam. 
Set the spam threshold (from 0 to 100) for considering an e-mail to be spam. 
The ZyWALL classifies any e-mail with a spam score greater than or equal to 
the threshold as spam. It classifies any e-mail with a spam score less than the 
threshold as not being spam. 
A lower threshold catches more spam e-mails, but may also classify more 
legitimate e-mail as spam. 
A higher threshold lessens the chance of classifying legitimate e-mail as 
spam, but may allow more spam to get through.