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Different filtering policies can be defined for users and user groups. The rules are
those that specify which filters to use to analyze the message and the actions to take
on spam, based on the groups to which the sender and the recipients belong.
The Antispam filters are grouped into two categories:
● Global filters - configurable filters meant to filter all incoming mail traffic, regardless
of the policies set.
● Policy filters - filters applied to the incoming mail traffic according to the specified
policies.
5.2.1. Global Filters
There are 4 global filters: Allow / Deny IP List, Sender Black List, IP Match and
Real-time Blackhole List.
Note
These filters must be configured globally by the administrator. In order to configure
them, go to the Antispam module, Antispam section and click Global Filters. For more
details, please refer to “Configuring Global Antispam Filters” (p. 152).
Allow / Deny IP List
The Allow / Deny IP List enables the administrator to specify IP addresses which are
denied access to the server. All incoming connections from addresses that appear on
the Deny IP List are dropped, provided that such addresses do not appear on the
Allow IP List. The Allow IP List is used to except IP addresses from ranges of IP
addresses defined on the Deny IP List.
Sender Black List
The Sender Black List allows the administrator to specify a list of e-mail addresses
which are denied access to the server. The incoming mail from these addresses will
be dropped before reaching the server.
IP Match
Spammers often try to "spoof" the sender's e-mail address to make the e-mail appear
as being sent by someone in your domain. To prevent this, you can use IP Match.
If a message appears to be from a domain that you have specified in the IP Match
rule list (such as your own company domain), BitDefender checks to see if the IP
Core Modules
17
BitDefender Security for Exchange