How to enable DNSBL or RBL on Zimbra to fight against spam
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 . Configure Then, go to Global Settings . Global Settings Next, go to MTA . I’ve enabled some parameters to harden the server, and added the RBLs that Zimbra supports. You could add the RBLs of your choice here. MTA Changes Save your settings. There no need to do any service restarts. Zimbra...