Self-hosted email: open-source Postfix, Mailcow, and full-stack mail server alternatives
Gmail charges $6-18/user/mo for Workspace and reads your mail for ad targeting. Self-hosted Mailcow and Mailu give a full Postfix + Dovecot + Roundcube + spam filter stack with one docker-compose, on a $10/mo VPS. The open-source mail servers ranked by health.
The 24 picks, ranked by health
Health score is a 6-dimension composite. See methodology.
Mail hosting made simple
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
The open-source notification infrastructure. In-app Inbox component, E-mail, SMS, Push and Slack Integrations.
The open-source notification infrastructure. In-app Inbox component, E-mail, SMS, Push and Slack Integrations.
A fast, highly extensible, and event driven SMTP server
Keep passwords and other sensitive information out of your inboxes and chat logs.
Easy to use, yet comprehensive library for sending mails with Go
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
Insular email distribution - mail server as Docker images
The SimpleLogin back-end and web app
High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.
Build and send emails using React
a mailer library for Rust
mailcow: dockerized - + =
A few simple, but solid patterns for responsive HTML email templates and newsletters. Even in Outlook and Gmail.
Event-driven networking engine written in Python.
Composable all-in-one mail server.
Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)
The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.
Fully featured, open source, privacy friendly email app for Android
A fully featured open source mail delivery platform for incoming & outgoing e-mail
The Official Twilio SendGrid Golang API Library
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
Anonymous email forwarding
Specifically replacing
These categories on ossreplace cover the SaaS in this space.
Ready to self-host?
Most operators land on modoboa (top health) and run it on hetzner for around $4.13/mo.