Figure 126 Anti-Spam: External Db; Table 86 Anti-Spam: External Db - ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 User Manual

Figure 126 Anti-Spam: External DB

The following table describes the labels in this screen.

Table 86 Anti-Spam: External DB

LABEL
External Database
Enable External
Database
Spam Threshold
Chapter 15 Anti-Spam
DESCRIPTION
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.
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 score threshold (from 0 to 100) for considering an e-mail to be
spam. The ZyWALL classifies any e-mail with a spam score at or below the
spam threshold as not being spam and any e-mail with a spam score higher
than the spam threshold as being spam.
A lower spam threshold catches more spam e-mails, but may also classify
more legitimate e-mail as spam.
A higher spam threshold lessens the chance of classifying legitimate e-mail as
spam, but may allow more spam to get through.
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