Posts by Xiao Guoan (Admin)

Set Up Authoritative DNS Servers with Webmin

How to Set Up Authoritative DNS Servers with Webmin

In previous tutorials, we explained how to set up authoritative DNS servers and edit DNS records from the command line.…

How to Create DNS Records at Cloudflare

How to Create DNS Records at Cloudflare

In my mail server tutorials, I recommend running mail server on ScalaHosting VPS, because their IP addresses are not on…

Install Webmin on CentOS 8 RHEL 8 Server

How to Install Webmin on CentOS 8/RHEL 8 Server

Webmin is a free and open-source control panel for administering Unix/Linux servers. This tutorial will be showing you how to…

How to Install Webmin on Ubuntu 20.04 Server

How to Install Webmin on Ubuntu 20.04 Server

Webmin is a free and open-source control panel for administering Unix/Linux servers. This tutorial will be showing you how to…

How to Fix “can’t read superblock” Error on Linux (ext4 & Btrfs)

Recently my Linux desktop computer can’t mount my 5TB external hard disk drive (HDD), and the file manager displays the…

How to Create a Linux VPS Server on ScalaHosting

How to Create a Linux VPS Server on ScalaHosting

ScalaHosting is my recommended VPS (Virtual Private Server) provider for running email servers. This article is going to explain how…

Secure Email Server Against Hacking

How to Secure Email Server Against Hacking with VPN (CentOS/RHEL)

In this tutorial, I’m going to share with you my tips and tricks to secure CentOS/RHEL email servers against hacking…

Set Up SSH Two-Factor Authentication (2FA) on CentOS RHEL Server

Set Up SSH Two-Factor Authentication (2FA) on CentOS/RHEL Server

This tutorial will show you how to set up SSH two-factor authentication on CentOS/RHEL server using the well-known Google Authenticator.…

centos ssh public key authentication

2 Simple Steps to Set Up SSH Public Key Authentication on CentOS

This tutorial explains how to set up SSH public key authentication on a CentOS/RHEL desktop. There’re basically two ways of…

Secure Email Server Against Hacking

How to Secure Email Server Against Hacking with VPN (Debian/Ubuntu)

In this tutorial, I’m going to share with you my tips and tricks to secure email servers against hacking with…

Set Up ModSecurity with Nginx on Debian Ubuntu

How to Set Up ModSecurity with Nginx on Debian/Ubuntu

This tutorial is going to show you how to install and use ModSecurity with Nginx on Debian/Ubuntu servers. ModSecurity is…

Set Up ModSecurity with Apache on Debian Ubuntu

How to Set Up ModSecurity with Apache on Debian/Ubuntu

This tutorial is going to show you how to install and use ModSecurity with Apache on Debian/Ubuntu servers. ModSecurity is…

How to Install EteSync 2.0 (Etebase) Server on Ubuntu

How to Install EteSync 2.0 (Etebase) Server on Ubuntu

This tutorial is going to show you how to install EteSync server on Ubuntu. EteSync is an open-source, end-to-end encryption…

ProtonVPN on Desktop Linux

How To Install and Use ProtonVPN on Desktop Linux

ProtonVPN is a VPN service provider based in Switzerland. In this article, I’m going to show you how to use…

skype ubuntu 18.04

3 Ways to Install Skype on Ubuntu 18.04/20.04 Desktop

This tutorial is going to show you 3 ways to install Skype on Ubuntu 18.04/20.04 desktop: install Skype from the…

elastic kibana dashboard

Set Up ParseDMARC on Ubuntu 20.04 to Analyze DMARC Reports

ParseDMARC is an open-source, self-hosted DMARC report analyzer. For those who don’t know, DMARC is an email security standard that…

Install Akaunting Self-Hosted Accounting Software on Ubuntu 20.04

Install Akaunting Self-Hosted Accounting Software on Ubuntu 20.04

This tutorial will be showing you how to install Akaunting on Ubuntu 20.04 with Apache or Nginx web server. Akaunting…

Setting Up Amavis and ClamAV on CentOS 8 RHEL 8 Mail Server

Setting Up Amavis and ClamAV on CentOS 8/RHEL 8 Mail Server

This is part 10 in the CentOS 8/RHEL 8 mail server from scratch tutorial series. In this article, I will…

Set Up BIND Authoritative DNS Server on CentOS 8 RHEL 8

Set Up BIND Authoritative DNS Server on CentOS 8/RHEL 8

This tutorial will be showing you how to set up and run your own authoritative name server on CentOS 8/RHEL…

SMTP-relay-2-postfix-centos-rhel

Set Up SMTP Relay Between 2 Postfix SMTP Servers on CentOS/RHEL

Previously we discussed setting up Postfix SMTP relay with mailjet, which is useful when you have to use a commercial…