Mailtrain

What it is

Mailtrain is free, open-source newsletter software that you install on your own server. A Droptica guide to open-source email marketing platforms describes it as "a self-hosted newsletter application built with Node.js and MySQL or MariaDB" that "targets list management, subscriber preferences and newsletter campaigns on infrastructure you control." A roundup on university.tenten.co calls it an "open source modern Nodejs based email marketing application and auto responder," and a GoogieHost guide says it is "built on top of Nodemailer, made for people who want full control over their email marketing."

Because it is self-hosted, subscriber lists and campaign data sit in a database on a server you run rather than with a vendor. The Droptica guide lists "Internal lists: subscribers stay on your servers and databases" among the reasons to consider it. A 2026 guide on acellesend.com lists Mailtrain as "GPL, Node.js" and among the tools that are "free to download, full code public on GitHub, self-hosted." The tenten.co roundup adds "You can download this app from its Github Repository for Free and host on your server," and links to a demo.

Lists, fields and segmentation

List management is where the sources agree Mailtrain is strongest. The GoogieHost guide says it "makes it easy to handle large subscriber lists, even into the millions," and that you can "add contacts manually, import them via CSV, or connect through the API." It describes custom fields of different types, "like text boxes, numbers, dropdowns and checkboxes," which "can be used inside emails through merge tags to personalize messages."

Segmentation works by rules inside a list. In GoogieHost's words, "Instead of creating many similar lists, Mailtrain lets you segment one list using rules. You can send campaigns only to subscribers who match specific conditions." An n8n blog post on open-source marketing tools singles out tags, calling them "Mailtrain's detailed and user-friendly tagging feature" that "allows anyone to always target the right groups of customers," and notes that Mailtrain offers "unlimited user profiles and recipients."

Campaigns and automation

The tenten.co roundup sums up the core loop: "You can build your email list and can send, track and manage email campaign." The n8n post describes the campaign builder as "basic, but wonderfully effective at automating and creating detailed marketing campaigns," and says its service outline "is very standard, which can be interpreted well for any business that needs to create campaigns, segment users and pump out some emails."

RSS campaigns are a named feature. GoogieHost says "Mailtrain can watch your RSS feed and automatically send emails when new content appears. It builds the campaign using the feed data and delivers it to your subscribers." The same guide mentions "GPG encryption and detailed click tracking," and its comparison table lists automated triggered campaigns and a drag-and-drop builder for Mailtrain. The Droptica guide is more cautious, advising readers to "Validate template editing, automation and reporting against your requirements before commit," and positions Mailtrain for teams where "broadcasts matter more than multi-channel journeys" and who "do not need CRM-grade journeys yet."

Sending

Mailtrain does not include its own delivery network. The tenten.co roundup says "It supports Popular email sending gateway like Amazon SES or Standalone SMTP service as well," and an xgenious.com guide describes it as a free newsletter tool "with list management, templates, and SMTP or SES sending." GoogieHost lists "Works with any SMTP provider" among the pros and "Needs separate email sending infrastructure" among the cons.

A guide on sendbroadcast.net, which names Mailtrain among the main free and open-source self-hosted platforms in 2026, explains how that split works for self-hosted tools in general: you "typically still use a third-party SMTP relay or ESP" for the physical sending, and "the relay sees the outgoing email, not your subscriber list."

Price and license

Mailtrain costs nothing to use. The n8n post says "Mailtrain is absolutely free for any company needing a basic, open source email marketing tool." GoogieHost lists its plan as "100% Free to Use (Open Source self hosted email service)" with "Full access to the Mailtrain platform," and the xgenious.com guide lists the price as free. The costs you do carry are your server and your sending provider; the xgenious.com guide says of the free open-source options that "You pay only for your server and your own sending costs through AWS SES or Gmail."

The license matters if you plan to resell. The acellesend.com guide notes that the GPL and AGPL tools it covers, Mailtrain included, can carry source-availability obligations if you run a modified version as a service to others.

Maintenance and support

Official support is thin. GoogieHost lists "Limited official support options" among the cons, and the Droptica guide says Mailtrain suits teams whose "team can deploy and patch a Node application."

Development activity is the caveat raised most directly. A September 2026 guide on thefrontkit.com says Mailtrain's "repository was last pushed on 5 October 2025, nearly a year before this was written," adding "It is not archived, and it may well still run fine." Its verdict is "Best for: Existing installations. Not new ones." The xgenious.com guide similarly lists "Less active development than the leaders" among the cons, alongside "Broadcast-only, no outreach sequences" and "No sender rotation," while calling it "a reasonable broadcaster if you want a straightforward open-source newsletter tool."

Who it suits and who it does not

Mailtrain suits technical teams that want a free newsletter system on their own servers, with subscriber data in their own database and sending through Amazon SES or an SMTP relay they choose. GoogieHost names media and newsletter publishers as a strong fit, because the software "can comfortably handle huge subscriber databases without extra per-contact fees" and its "RSS-to-email feature makes it easy to automatically send new articles to readers," and adds B2B teams that want segmentation and custom fields. Organizations already running Mailtrain have a working, free tool with no licensing costs.

It is a harder choice for a new deployment. Someone has to install and patch a Node.js application and its database, set up a sending provider, and manage without a vendor support desk. Given the gap in repository activity that thefrontkit.com points out, teams starting fresh should check the project's current state on GitHub before committing their list to it. Cold outreach is outside its scope; the xgenious.com guide is clear that it is a broadcast tool.