[Mailtrain](https://mailtrain.org/) is an open-source self hosted newsletter app built on Node.js and MySQL/MariaDB. Mailtrain's source is on [GitHub](https://github.com/Mailtrain-org/mailtrain). This guide will show you how to install Mailtrain on a fresh CentOS 7 Vultr instance. - Software Requirements: - Node.js v7 or greater - MariaDB - Nginx - Redis (optional) - Hardware Requirements: - 1 vCPU - 1024 MB RAM Check the CentOS version. cat /etc/centos-release Creat......