How to Set Secure Password Policy on Zimbra

In this guide, we'll look at all the modification you need to Set Password Policy on Zimbra server. By default, Zimbra doesn't enforce any strong password requirements for a user account. This...

Managing Distribution Lists on Zimbra Mail Server

Welcome to our guide on Managing Distribution Lists on Zimbra Mail Server. Zimbra is among the most used Email collaboration systems. It has proven to be a reliable, scalable open source...
Configure whitelist and blacklist Zimbra Amavis Spam filtering

Configure whitelist and blacklist Zimbra Amavis Spam filtering

If you're on this page it means you've experienced noqueue messages on Zimbra Amavis for some emails. On this guide, I'll show you how to Configure whitelist and blacklist Zimbra Amavis Spam filtering....

Fix ERROR: zclient.IO_ERROR (invoke Connection refused, server: localhost) (cause: java.net.ConnectException Connection refused on Zimbra

Ever encountered this error " INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused INFO: Retrying request ERROR: zclient.IO_ERROR (invoke Connection refused, server: localhost) (cause: java.net.ConnectException Connection refused)" on Zimbra. When you...

Zimbra Firewall Configuration with ufw for Ubuntu and firewalld for CentOS

In this guide, we're going to look at how to secure your Zimbra collaborative suite on CentOS 7.x and Ubuntu server using Firewalld and Ufw respectively. If your server is running...
Dockerizing Zimbra

Running Zimbra on Docker Container

I’ve been working on  Dockerizing Zimbra on CentOS 7 base image. The hard work has finally yielded fruits and in this post, I’m going to share my Docker Github repository which...