Setting up RBL lists in Fortigate to avoid SPAM

If our intention is to block all spam that passes through our firewall, RBL lists are most commonly configured, and this document shows how to configure them on a Fortinet firewall, in a Fortigate. RBL is the acronym for “Realtime Blackhole list” or “Real-time blacklist”. These are systems that publish a database with a list of IP addresses that have been the source of unsolicited email sendings (SPAM). These databases are consulted online in real time by AntiSpam systems or mail servers before accepting a new email and said email will be marked as spam or we will reject it, according to interest.