Chapter 15 Anti-Spam
ZyWALL 5/35/70 Series User’s Guide
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Figure 179 SECURITY > ANTI-SPAM > External DB
The following table describes the labels in this screen.
Table 88 SECURITY > ANTI-SPAM > External DB
LABEL DESCRIPTION
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.
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