Best Self-Hosted Mail Server Tools

4 self-hostable mail server tools you can run on your own server — compared on specs, deployment difficulty, and the SaaS each one replaces.

Mail Serverdocker-mailserver

A production-ready, config-driven mail server in a single container — Postfix, Dovecot, and Rspamd with no database and no web UI, configured entirely from plain files. A lightweight, MIT-licensed self-hosted alternative to Google Workspace email. As with any self-hosted mail, expect to manage deliverability (SPF, DKIM, DMARC, and reverse DNS) so your mail reaches inboxes.

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Mail ServerMailcow

A full-featured, Docker-based mail server suite — Postfix, Dovecot, SOGo webmail, ActiveSync, antispam, and a polished admin UI — the popular self-hosted alternative to Google Workspace and Microsoft 365 for small teams. It is a heavier, multi-container stack: 6 GB of RAM is the minimum, 8 GB recommended. As with any self-hosted mail, expect to manage deliverability (SPF, DKIM, DMARC, and reverse DNS) so your mail reaches inboxes.

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Mail ServerMailu

A simple, full-stack mail server as a set of Docker images — SMTP/IMAP, webmail, antispam, and an admin panel generated by a setup wizard. A lighter, MIT-licensed self-hosted alternative to Google Workspace for personal and small-team email. As with any self-hosted mail, expect to manage deliverability (SPF, DKIM, DMARC, and reverse DNS) so your mail reaches inboxes.

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Mail ServerStalwart

An all-in-one, self-hosted mail server written in Rust — SMTP, IMAP, JMAP, and CalDAV/CardDAV in a single binary with a built-in admin UI. The modern, low-footprint way to run your own email instead of Google Workspace or Microsoft 365.

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Replace a paid tool

Self-hosted Google Workspace alternatives →Self-hosted Microsoft 365 alternatives →

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