ZyXEL Communications 200 Series User Manual

Chapter 33 Anti-Spam

ZyWALL USG 100/200 Series User’s Guide

Figure 422   Anti-X > Anti-Spam > General

The following table describes the labels in this screen. 

Table 177   Anti-X > Anti-Spam > General

General Settings

Click Advanced to display more settings. Click Basic to display fewer settings.

Enable Anti-
Spam

Select this check box to check SMTP (TCP port 25) and POP3 (TCP port 110) 
traffic for spam e-mail. 

Action taken 
when mail 
sessions 
threshold is 
reached

An e-mail session is when an e-mail client and e-mail server (or two e-mail servers) 
connect through the ZyWALL. Select how to handle concurrent e-mail sessions that 
exceed the maximum number of concurrent e-mail sessions that the anti-spam 
feature can handle. See the chapter of product specifications for the threshold. 
Select Forward Session to have the ZyWALL allow the excess e-mail sessions 
without any spam filtering.
Select Drop to have the ZyWALL drop mail connections to stop the excess e-mail 
sessions. The e-mail client or server will have to re-attempt to send or receive e-
mail later when the number of e-mail sessions is under the threshold.

Policy Summary

Priority

This is the position of an anti-spam policy in the list. The ordering of your anti-spam 
policies is important as the ZyWALL applies them in sequence. Once traffic 
matches an anti-spam policy, the ZyWALL applies that policy and does not check 
the traffic against any more policies.

From

The anti-spam policy has the ZyWALL scan e-mail traffic that is coming from this 
zone and going to the To zone. 

To

The anti-spam policy has the ZyWALL scan e-mail traffic that is going to this zone 
from the From zone. 

Protocol

These are the protocols of traffic to scan for spam.
SMTP applies to traffic using TCP port 25.
POP3 applies to traffic using TCP port 110.