Open-source Mailjet alternatives

listmonk is a self-hosted application for managing newsletters and mailing lists. It is distributed as a single binary, backed by a PostgreSQL database, and gives you a modern web dashboard for managing subscribers, lists and email campaigns. A live demo and documentation on listmonk.app let you look around before installing.

Topics show the scope: email marketing, newsletter management, campaign management, SMTP delivery, transactional emails and SMS gateway use. Installation is straightforward. With Docker you use the published image and a sample compose file and then visit port 9000. With the binary you generate a config file, run the install step to set up the database, or run an idempotent upgrade, and start the server.

Its server side is Go, while the interface is built with Vue and the Buefy component library. The project is free software under the AGPL-3.0 license, and a developer setup guide helps contributors. It suits creators, organizations and developers who want to send newsletters through their own SMTP provider without per-subscriber fees from a hosted email service.

Postal is a complete mail server for websites and web servers that handles both outgoing and incoming email. The project describes it as an open-source take on services such as Sendgrid, Mailgun and Postmark, ready to run on your own servers rather than rented as a hosted API.

It is written in Ruby and released under the MIT license. The project provides documentation with installation instructions, an FAQ and features list, a separate repository of installation tools, and community support through GitHub Discussions and Discord. Repository topics list Ruby, mail, SMTP and mail server.

Because it is self-hosted, Postal suits teams that want control over their own email delivery infrastructure instead of relying on a hosted provider, such as websites that send transactional messages.

Plunk is an open-source email platform that combines transactional email, marketing campaigns and workflow automation in a single product. Developers can send messages from an API with templates and variable substitution, or use Plunk as an SMTP relay so that existing tools and frameworks can send through it.

Marketing features include campaigns for newsletters and product updates, dynamic segments, and contact management with custom fields and activity history. Workflows add triggers, delays and conditional logic, analytics track opens, clicks and bounces, custom domains are verified with DKIM and SPF, and inbound emails can be received and routed with custom rules.

Plunk is positioned as an open-source, self-hosted alternative to services such as SendGrid, Resend and Mailgun. It is licensed under AGPL-3.0, written in TypeScript, and can be deployed from an official Docker image following the project's documentation. The README cites a rate of $0.001 per email with no contact limits.

BillionMail is an open-source platform that combines a mail server with newsletter and email marketing tools. It is meant for businesses and individuals who want to send newsletters, promotional email, or transactional messages themselves instead of paying monthly fees to a marketing service. It is written in Go and released under the AGPL-3.0 license.

Under the hood it relies on established components, with topics naming Postfix, Dovecot, Rspamd, and SMTP. The product adds campaign creation and sending, advanced analytics, and customer management on top, and the README promotes a quick three-step setup. Documentation is available in several languages and there is a Discord community.

Running your own mail infrastructure involves deliverability work such as DNS records and sender reputation, which the README does not detail. It suits developers, small businesses, and communities that want control over their email lists and sending, and that are willing to host and maintain the server.

Notifuse is a modern, self-hosted emailing platform for sending newsletters and transactional email at a fraction of the cost of hosted services. It is built with Go and React and presented as an open-source alternative to Mailchimp, Brevo, Mailjet, Listmonk, MailerLite, and Klaviyo. The input lists its license only as other.

Email marketing features include a drag-and-drop visual builder with MJML components and live preview, campaign scheduling, A/B testing of subject lines, content, and send times, list segmentation, and contact profiles with custom fields. Automations use a visual canvas with nodes for delays, emails, branches, filters, list changes, A/B tests, and webhooks, and Liquid templating personalizes messages. Messages are sent through seven providers, with topics naming Amazon SES, Mailgun, Postmark, and SendGrid.

For people who prefer not to run it themselves, Notifuse Cloud offers managed hosting, which the README says starts at 16 dollars per month, and a live demo is available. It suits marketers and developers who want lower costs and control over subscriber data.