User`s guide

Chapter 3 Managing the Barracuda Spam Firewall ■ 37
Using the Block/Accept Filters
Using the Block/Accept Filters
The IP BLOCK/ACCEPT tab provides a wide range of filters that enhance the default spam and virus
detection capabilities of the Barracuda Spam Firewall.
The Barracuda Spam Firewall supports the use of regular expressions in the block/accept filters. For
more information on using regular expressions, refer to Appendix A.
The following table lists the various block/accept filters.
Filtering by IP Address/Network
The BLOCK/ACCEPT-->IP Block/Accept page lets you filter messages based on the sender’s IP
network.
The following table describes the fields on this page.
Block/Accept Filter Refer to
Sender IP address page 37
Sender domain page 38
Sender email address page 38
Recipient email address page 39
Attachment type page 39
Subject line content page 40
Body content page 41
Header content page 41
Filter Description
Allowed IP Range Add any IP addresses or networks that you wish to add to your whitelist. To
add an individual IP address, use a netmask of 255.255.255.255.
Whitelisted IP addresses bypass spam scoring as well as all other blacklists
with the exception of attachment, body, and subject filters.
Use the comment field to add any notes about the allowed IP address.
Click Add after adding each entry, followed by Save Changes.
Blocked IP Range Add any IP addresses or networks to your blacklist. To add an individual IP
address, use a netmask of 255.255.255.255.
Blacklisted IP addresses/networks bypass all whitelists with the exception of
IP address/network-based whitelists. You can specify whether the IP/Range
should be blocked, quarantined or tagged.
Use the comment field to add any notes about the blocked IP address.
Click Add after adding each entry, followed by Save Changes.