Best Self-Hosted Mail Servers, Tested

Self-hosted mail servers replace Google Workspace or Microsoft 365 with a mail server you run yourself — anywhere from a full webmail suite down to a single lightweight container. Mailcow is the heaviest, most complete option: SOGo webmail, ActiveSync, and a polished admin UI, but it wants 6 GB of RAM minimum (8 GB recommended). Mailu trades some of that polish for a lighter, MIT-licensed set of Docker images with a setup-wizard admin panel at 1 GB. docker-mailserver strips it down further still — a single container, no database, no web UI, configured entirely from plain files, at just 512 MB. Stalwart rebuilds the whole thing in Rust as one binary with a built-in admin UI. Whichever you pick, deliverability — SPF, DKIM, DMARC, and reverse DNS — is on you, not a hosting provider; compare these on RAM footprint and how much admin UI you want managing the rest for you.

Mail Server

docker-mailserver

A production-ready, config-driven mail server in a single container — Postfix, Dovecot, and a choice of Amavis/SpamAssassin or Rspamd antispam, 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.

Shell

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Mail Server

Mailcow

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.

PHPShell

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Mail Server

Mailu

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.

PythonShell

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Mail Server

Stalwart

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.

Rust

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Head-to-heads in this category

MailSep 2026

Mailcow

vs

docker-mailserver

The complete admin-UI suite vs. the bare config-file container.

Read the verdict →

MailSep 2026

Mailcow

vs

Mailu

The full groupware suite vs. the lighter wizard-built mail stack.

Read the verdict →

MailSep 2026

Mailu

vs

docker-mailserver

A web-managed suite vs. a config-file container.

Read the verdict →

MailSep 2026

Stalwart

vs

Mailcow

One Rust binary vs. the full container suite.

Read the verdict →

MailAug 2026

Stalwart

vs

Mailu

A single Rust binary vs. a wizard-built Docker Compose suite.

Read the verdict →