Using a real-time blacklist

A Real-Time Blacklist (RBL) is a third-party published list of IP addresses that are known sources of spam. When RBL checking is enabled, messages from a sender listed on an RBL are prevented from entering your system. The Email Security module supports the use of the Spamhaus Datafeed server or the entry of up to three third-party RBLs for RBL lookups. Functionality is configured from the section Real-time Blacklist Options on the page Settings > Inbound/Outbound > Connection Control.

Configure the RBL

Steps

  1. Navigate to the page Settings > Inbound/Outbound > Connection Control.
  2. From the section Real-time Blacklist Options, mark the check box Perform RBL check.
    This feature is enabled by default.
  3. Save detailed connection information in the appliance mail processing log; mark the check box Save connection details in the mail processing log.
    If you enable this option without designating a third-party RBL, the email protection system still collects log information that email content filters can use for subsequent message analysis.
  4. Under Spam RBL service, select one of the following RBL lookup methods:
    • Spamhaus service

      Use the Spamhaus server for RBL lookups.

    • Domain address

      Enter up to three domain addresses of the RBL services to use. Separate multiple addresses with a semicolon (;).

  5. Click OK.
    The settings are saved.