Configure reverse DNS for Zimbra mail server and check Black List In this article, I will show you how to configure DNS reserce for Zimbra mail server and check the black list. Why do we need reverse DNS? At the beginning of this serie, you have configured the DNS record to resolve the mail domain
This article will show you how to configure DMARC for Zimbra mail server 8.8.12. After configuring DKIM, SPF, we will now configure DMARC. Here are 3 essential information to protect your mail server, so you can send mail securely. What is DMARC? According to information from Zimbra, we define DMARC as: DMARC, which stands for
This article, I will guide you how to configure SPF for Zimbra mail server 8.8.12. Next of the article configuring DKIM, we will now continue to configure the SPF. What is an SPF? Right, first, we need to know what SPF is? Why do we need to configure it? According to Zimbra, SPF defines: Sender
This article, I will show you how to configure DKIM for Zimbra mail server 8.8.12. What is DKIM? Why do we have to configure it? And how do we configure DKIM in Zimbra? How do mail servers block spam? You have successfully installed Zimbra mail server, but that is not enough. Now, you can email
In this article, I will guide you to install Zimbra mail server in CentOS 7. Over the last 2 articles in this serie, you have finished preparing the server for installing Zimbra. Now we will do that. Remove Postfix and install dependencies First, you need to turn off the Postfix service if it is running.
In this article, I will show you how to install NTP and DNS for Zimbra mail server. As in the previous article, you have prepared a server to install Zimbra. Now, we will continue to prepare NTP and DNS for mail servers. Install and set up NTP service There is a service that quite a
This article will talk about Prepare to install Zimbra mail server 8.8.12 Introducing Zimbra mail server For those who don’t know about Zimbra, I’ll talk briefly about it so you can understand it. Zimbra is an open source solution for mail servers. You can get used to Gsuite from Google or Microsoft Office 365. For
Before we go into installing the Rocket Chat system, the first thing to do is to determine the system resource. This article I will talk about sizing the Rocket chat system. Determine the size of your organization You need to determine how many users your company has? 50, 100, 500, 1000, 2000 or 5000 users.
Have you heard of Rocket Chat? What is it? This article will introduce to you about the Rocket Chat system. Demand from companies Many companies have employees who use Skype to chat with each other, send and receive job information. It is a great tool. But there is a problem, information can be leaked by
How to list the tag of a container image? In the previous article, you already know what the tag of an image container is. On the Docker Hub website, you can see all the tags easily. But if you use the search command, how can you list all tags of an image? Docker registry API