Chapter 40 Anti-Spam
ZyWALL USG Series User’s Guide
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The following table describes the labels in this screen.
Table 281 Configuration > UTM Profile > Anti-Spam > DNSBL
LABEL DESCRIPTION
Show Advanced
Settings / Hide
Advanced Settings
Click this button to display a greater or lesser number of configuration fields.
Enable DNS Black List
(DNSBL) Checking
Select this to have the Zyxel Device check the sender and relay IP addresses in e-mail
headers against the DNSBL servers maintained by the DNSBL domains listed in the Zyxel
Device.
DNSBL Spam Tag Enter a message or label (up to 15 ASCII characters) to add to the beginning of the mail
subject of e-mails that have a sender or relay IP address in the header that matches a
black list maintained by one of the DNSBL domains listed in the Zyxel Device.
This tag is only added if the anti-spam policy is configured to forward spam mail with a
spam tag.
DSBNL X-Header Specify the name and value for the X-Header to be added to e-mails that have a sender
or relay IP address in the header that matches a black list maintained by one of the
DNSBL domains listed in the Zyxel Device.
Max. IPs Checking Per
Mail
Set the maximum number of sender and relay server IP addresses in the mail header to
check against the DNSBL domain servers.
IP Selection Per Mail Select first N IPs to have the Zyxel Device start checking from the first IP address in the mail
header. This is the IP of the sender or the first server that forwarded the mail.
Select last N IPs to have the Zyxel Device start checking from the last IP address in the
mail header. This is the IP of the last server that forwarded the mail.
Query Timeout Setting
SMTP Select how the Zyxel Device is to handle SMTP mail (mail going to an e-mail server) if the
queries to the DNSBL domains time out.
Select drop to discard SMTP mail.
Select forward to allow SMTP mail to go through.
Select forward with tag to add a DNSBL timeout tag to the mail subject of an SMTP mail
and send it.
POP3 Select how the Zyxel Device is to handle POP3 mail (mail coming to an e-mail client) if the
queries to the DNSBL domains time out.
Select forward to allow POP3 mail to go through.
Select forward with tag to add a DNSBL timeout tag to the mail subject of an POP3 mail
and send it.
Timeout Value Set how long the Zyxel Device waits for a reply from the DNSBL domains listed below. If
there is no reply before this time period expires, the Zyxel Device takes the action defined
in the relevant Actions when Query Timeout field.
Timeout Tag Enter a message or label (up to 15 ASCII characters) to add to the mail subject of e-mails
that the Zyxel Device forwards if queries to the DNSBL domains time out.
Timeout X-Header Specify the name and value for the X-Header to be added to e-mails that the Zyxel
Device forwards if queries to the DNSBL domains time out.
DNSBL Domain List
Add Click this to create a new entry.
Edit Select an entry and click this to be able to modify it.
Remove Select an entry and click this to delete it.
Activate To turn on an entry, select it and click Activate.
Inactivate To turn off an entry, select it and click Inactivate.
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