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Some spammers use unsecured third party SMTP servers to send unsolicited bulk email. Using
DNSBLs and ORDBLs is an effective way to tag or reject spam as it enters your network. These lists
act as domain name servers that match the domain of incoming email to a list of IP addresses known
to send spam or allow spam to pass through.
There are several free and subscription servers available that provide reliable access to continually
updated DNSBLs and ORDBLs. Please check with the service you are using to confirm the correct
domain name for connecting to the server.
Note:
Because the freeGuard 100 uses the server domain name to connect to the DNSBL or ORDBL
server, it must be able to look up this name on the DNS server. For information on configuring DNS,
see “config system dns” .
Command syntax pattern
config spamfilter rbl
edit <server_integer>
set <keyword> <variable>
end
config spamfilter rbl
edit <server_integer>
unset <keyword>
end
config spamfilter rbl
delete <server_integer>
end
get spamfilter rbl [<server_integer>]
show spamfilter rbl [<server_integer>]
spamfilter rbl command keywords and variables
Keywords & Variables Description
Default
action {reject | spam}
Enter reject to stop any further processing of the current session
and to drop an incoming connection at once. Enter spam to
identify email as spam.
spam
server <name_str>
Enter the name of a Real-time Blackhole List server or an Open
Relay Database server.
No
default.
status {enable |
disable}
Enable or disable querying a Real-time Blackhole List server or
an Open Relay Database server.
enable
Example
This example shows how to add the DNSBL server bl.spamcop.net to the second position in the list
and reject email identified as spam, and add the ORDBL relays.ordb.org to the third position in the list
and mark email identified as spam.
Summary of Contents for freeGuard 100
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