166
•
config spamfilter bword
•
config spamfilter ipbwl
•
config spamfilter mheader
•
config spamfilter rbl
9.3 shield
Use this command to configure the settings for the Antispam Service.
The freeGuard 100 spam filters are generally applied in the following order:
•
shield: Shield Antispam Service
•
ipbwl : IP address list
•
rbl: DNSBL & ORDBL
•
emailbwl: Email address list
•
mheader: MIME headers
•
bword: Banned words
The antispam system from freedom9 that includes an IP address black list, a URL black list, and spam
filtering tools. The IP address black list contains IP addresses of email servers known to be used to
generate Spam. The URL black list contains URLs of website found in Spam email.
This compiles the IP address and URL list from email captured by spam probes located around the
world. Spam probes are email addresses purposely configured to attract spam and identify known
spam sources to create the antispam IP address and URL list. Shield combines IP address and URL
checks with other spam filter techniques in a two-pass process.
On the first pass, if spamfsip is selected in the protection profile, extracts the SMTP mail server source
address and sends the IP address to a server to see if this IP address matches the list of known
spammers. If spamfsurl is selected in the protection profile, this checks the body of email messages to
extract any URL links. These URL links will be sent to a server to see if any of them is listed. Typically
Spam messages contain URL links to advertisements (also called spamvertizing).
If an IP address or URL match is found, terminates the session. If this does not find a match, the mail
server sends the email to the recipient.
As each email is received, performs the second antispam pass by checking the header, subject, and
body of the email for common spam content. If finds spam content, the email is tagged or dropped
according to the configuration in the firewall protection profile.
Both antispam processes are completely automated and configured by freedom9. With constant
monitoring and dynamic updates, is always current. You can enable or disable in a firewall protection
profile.
Command syntax pattern
config spamfilter shield
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