Chapter 24 Anti-Spam
ZyWALL (ZLD) CLI Reference Guide
217
This table describes the DNSBL commands.
Table 122 DNSBL Commands
COMMAND DESCRIPTION
[no] anti-spam dnsbl activate Turns DNSBL checking on or off.
anti-spam dnsbl [1..5] domain
dnsbl_domain {activate|deactivate}
Adds or edits a DNSBL domain for checking e-mail header IP addresses.
no anti-spam dnsbl domain dnsbl_domain Removes the specified DNSBL domain.
anti-spam dnsbl query-timeout smtp {drop
| forward | forward-with-tag}
Sets how the ZyWALL handles SMTP mail (mail going to an e-mail server)
if the queries to the DNSBL domains time out.
anti-spam dnsbl query-timeout pop3
{forward | forward-with-tag}
Sets how the ZyWALL handles POP3 mail (mail coming to an e-mail client)
if the queries to the DNSBL domains time out.
anti-spam dnsbl max-query-ip [1..5] Sets up to how many sender and relay server IP addresses in the mail
header to check against the DNSBL.
anti-spam dnsbl ip-check-order {forward
| backward}
Configures the order in which anti-spam checks e-mail header IP
addresses against the DNSBLs.
• forward checks the first N IP addresses. Checking starts from the first
IP address in the mail header. This is the IP of the sender or the first
server that forwarded the mail.
• backward checks the last N IP addresses. Checking starts from the
last IP address in the mail header. This is the IP of the last server that
forwarded the mail.
anti-spam tag {dnsbl | dnsbl-timeout}
[tag]
dnsbl configures the message or label 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 blacklist maintained by a DNSBL domain listed in the
ZyWALL.
dnsbl-timeout configures the message or label to add to the mail
subject of e-mails that the ZyWALL forwards if queries to the DNSBL
domains time out.
Use up to 15 alphanumeric characters, underscores (_), colons (:), or
dashes (-).
show anti-spam dnsbl status Displays the activation status of the anti-spam DNSBL checking.
show anti-spam dnsbl domain Displays the ZyWALL’s configured anti-spam DNSBL domain entries.
show anti-spam dnsbl max-query-ip Displays how many sender and relay server IP addresses in the mail
header anti-spam checks against the DNSBL.
show anti-spam dnsbl ip-check-order Displays the order in which anti-spam checks e-mail header IP addresses
against the DNSBLs.
show anti-spam dnsbl query-timeout {smtp
| pop3}
Displays how the ZyWALL handles SMTP or POP3 mail if the queries to the
DNSBL domains time out.
show anti-spam tag {dnsbl | dnsbl-
timeout}
dnsbl displays the anti-spam tag for e-mails that have a sender or relay
IP address in the header that matches a blacklist maintained by a DNSBL
domain.
dnsbl-timeout displays the message or label to add to the mail subject
of e-mails that the ZyWALL forwards if queries to the DNSBL domains
time out.
show anti-spam dnsbl statistics Displays anti-spam DNSBL statistics for each configured DNSBL domain.
anti-spam dnsbl statistics flush Clears the anti-spam DNSBL statistics for each configured DNSBL domain.
anti-spam dnsbl query-timeout time
[1..10]
Sets how long the ZyWALL waits for a reply from the DNSBL domains.
show anti-spam dnsbl query-timeout time Displays how long the ZyWALL waits for a reply from the DNSBL domains.
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