The rbl-filter enable command enables the RBL filtering function in the mail filtering profile.
The undo rbl-filter enable command disables the RBL filtering function in the mail filtering profile.
The FW filters out junk mails by performing legitimacy check on the sender's SMTP server IP address. After receiving an SMTP message, the FW parses the IP address and matches it against the blacklist to determine whether a mail is a junk mail.
To enable the RBL filtering function, run the rbl-filter enable command in the mail filtering profile view, and run the rbl-filter enable command in the system view.
In the mail filtering profile view, the rbl-filter enable command is disabled by default.