Enable DNSBL or RBL on Zimbra

DNS-based Blackhole List (DNSBL) or Real-time Blackhole List (RBL) is an effort to fight spam emails. It is a blacklist of source IP addresses that have a reputation of sending spam emails. Most email systems can be configured to check these lists and block or flag emails that were sent from domains/IPs listed there. The ‘Blackhole List’ is sometimes called ‘blacklist’ by email admins.

In this tutorial, we’ll see how we can configure RBL with Zimbra using both GUI and CLI.

Method 1 – GUI:

Login to the Zimbra admin console – https://mail.example.com:7071, and then go to Configure.

Then, go to Global Settings. Continue reading “Enable DNSBL or RBL on Zimbra” »