Here's an overview of Mailtrain, a slick self-hosted newsletter app built on solid tech to jazz up your email campaigns. For anyone who's caught the self-hosting bug and wants control over their email marketing, Mailtrain is quite the gem. This open-source newsletter platform is anchored on Node.js and MySQL/MariaDB and is all about taking your email game to the next level. Whether your homelab setup needs a robust email campaign tool or you just like tapping into powerful, free software, Mailtrain v2 is a solid pick that brings the bacon home. Rewriting Mailtrain from the ground up, version 2 covers all bases from v1 and throws in some extra goodness. This means if you're hopping over from v1, the transition should be smooth as butter—just backup your database, and v2's got your schema upgrade covered. So, what's under the hood? First off, Mailtrain makes subscriber list management a breeze, complete with segmentation and custom fields. You can also craft stunning email templates, and it even offers MJML-based ones for those who hunger for that visual flair. Need a snapshot of your campaign’s performance? Custom reports have got your back. Automation is where Mailtrain really flexes its muscles, handling triggered and RSS campaigns without a hitch. Plus, it supports multiple users with fine-tuned permissions and sharing options, so everyone in your team can get their hands dirty according to their access level. Big organizations or enterprises will especially appreciate the hierarchical namespaces, designed for smooth, scalable operations. An awesome bonus is the built-in Zone-MTA. It makes mail delivery setup almost nonexistent, so you can focus more on the fun stuff. The minimal hardware it requires is pretty down-to-earth too—2 vCPU and 4096 MB RAM should do the trick. Now, let's dive into deployment. Whether you're rocking CentOS 7 or Ubuntu 18.04 LTS, Mailtrain's setup scripts have you covered for either a full public rollout secured by SSL or a local instance for testing and developing. If Docker's your jam, Mailtrain plays well with Docker and Docker Compose for quick and efficient deployment. Each of Mailtrain's three endpoints—trusted, sandbox, and public—serves its distinct role. The trusted endpoint is your main control room, while the sandbox is a behind-the-scenes workshop for WYSIWYG template editors. The public endpoint caters to your subscribers, handling subscription management forms and files. Security-wise, Mailtrain's multiple endpoint strategy is genius, reducing the attack surface and keeping those nasty XSS attacks at bay. Plus, with Let's Encrypt handling SSL certification, your endpoints are secure without breaking a sweat. If you're looking to craft killer email campaigns with robust, open-source software, Mailtrain's got the chops to deliver. Dive into your homelab, fire up this powerhouse, and watch your email marketing solutions blossom. The developers have laid out a comprehensive README on their GitHub repo that walks you through every step, from installation to handling advanced deployment scenarios. As far as open-source newsletter apps go, Mailtrain's definitely a top contender.