To configure the Spam Filter Client on a Barracuda NextGen Firewall F-Series, a Spam Filter service must be introduced on your firewall. The firewall processes spam in combination with the Mail gateway service following these procedures:
Configure the Spam Filter Client
- Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > Mail-Gateway > Mail Gateway Settings.
- In the left menu, select Content Adaptions.
- Click Lock.
- In the Spam Detection section, set Enable Spam Analysis to yes.
- Click Edit to open the Advanced Spam Options window.
- Set the appropriate values for the parameters explained in the sections below.
- Click OK.
Click Send Changes and Activate.
MailGW Settings - Spam Analysis
Spam Analyzer IP
This IP address is the bind IP of the Spam Filter service. Optionally, enter a DNS-resolvable hostname. The hostname is used to implement load balancing for high traffic scenarios.
Spam Analyzer Port
This value (default: 783) must correspond with the port defined for the Spam Filter service
Max. Size (MB)
This parameter defines the maximum size an email can have to be processed by the Spam Filter. If the email exceeds this value (default: 1 MB), it will not traverse the filter. Instead, it will be delivered to its recipient without header modification (spam tag).
This parameter defines the maximum allowed duration (default: 60 s) to analyze an email. If the value is exceeded, the email is delivered to its recipient without header modification (spam tag).
Analyze Internal Mails
When set to yes (default: no), mail traffic generated by internal mail domains is also classified.
An email is rejected when it exceeds this threshold. The threshold is calculated from an email’s spam score (resulting from the testing sequences) multiplied by 100. To deactivate this parameter, enter a threshold of 0.
Enable Domain Check
This field allows sender domains to be checked. The following options are available:
Domain Check failure results in one of the actions configured through the parameter Domain Action.
This action is carried out if the Domain Check fails:
This is list of trusted domains, which should be excluded from spam filtering. This list is consulted before the Spam Filter is applied. Top-level and sub domains can be defined E.g.,
Continue with How to Configure the Spam Filter Service.