The rbl-filter enable command enables the RBL filtering function.
The undo rbl-filter enable command disables the RBL filtering function.
The FW filters out junk mails by performing legitimacy check on the sender's SMTP server IP address. Upon receiving an SMTP message, the FW obtains the source IP address and determine whether the IP address is legitimate.
If the RBL filtering is configured, the FW uses the blacklist maintained by third-party anti-spam organizations and filters out junk mails from the latest sources.
To enable the RBL function, run the rbl-filter enable command in the system view and the rbl-filter enable command in the mail filtering profile view.
The rbl-filter enable command is disabled by default.