Chapter 28 Anti-Spam
USG20(W)-VPN Series User’s Guide
448
The following table describes the labels in this screen.
Table 175
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 USG check the sender and relay IP addresses in e-mail
headers against the DNSBL servers maintained by the DNSBL domains listed in the
USG.
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 USG.
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 USG.
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 USG 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 USG 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 USG 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 USG 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 USG waits for a reply from the DNSBL domains listed below. If there
is no reply before this time period expires, the USG 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 USG 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 USG
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
.
Summary of Contents for ZyWall USG20-VPN
Page 17: ...17 PART I User s Guide ...
Page 18: ...18 ...
Page 99: ...99 PART II Technical Reference ...
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