ZyXEL Communications 5 Series User Manual

Chapter 16 Anti-Spam Screens

ZyWALL 5/35/70 Series User’s Guide

Click SECURITY > ANTI-SPAM > External DB to display the Anti-Spam External DB 
screen.

Use this screen to enable or disable the use of the anti-spam external database. You can also 
configure the spam threshold and what to do when no valid spam score is received. You must 
register for this service before you can use it (see 

 for details). 

Forward SMTP & POP3 
mail with tag in mail 
subject

Select this radio button to have the ZyWALL forward spam e-mail with the 
tag that you define.
Even if you plan to use the discard option, you may want to use this initially 
as a test to check how accurate your anti-spam settings are. Check the e-
mail the ZyWALL forwards to you to make sure that unwanted e-mail is 
marked as spam and legitimate e-mail is not marked as spam.

Discard SMTP mail. 
Forward POP3 mail 
with tag in mail subject

Select this radio button to have the ZyWALL discard spam SMTP e-mail. The 
ZyWALL will still forward spam POP3 e-mail with the tag that you define.

Action taken when mail 
sessions threshold is 
reached

The anti-spam feature limits the number of concurrent e-mail sessions. An e-
mail session is when an e-mail client and e-mail server (or two e-mail 
servers) connect through the ZyWALL. Use this section to configure what the 
ZyWALL does when the number of concurrent e-mail sessions goes over the 
threshold (see the chapter of product specifications for the threshold).
Select Forward to have the ZyWALL allow the excess e-mail sessions 
without any spam filtering.
Select Block to have the ZyWALL drop mail connections to stop the excess 
e-mail sessions. The e-mail client or server will have to attempt to send or 
receive e-mail later when the number of e-mail sessions is under the 
threshold.

Apply

Click Apply to save your changes back to the ZyWALL.

Reset

Click Reset to begin configuring this screen afresh.

Table 88   SECURITY > ANTI-SPAM > General