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Best Open-Source Gmail / Google Workspace Alternatives (2026)

14 self-hostable, open-source projects that replace Gmail / Google Workspace — without per-mailbox fees and data privacy. Each is scored for how hard it is to self-host, with one-click deploy options where they exist.

Google Workspace charges a recurring per-mailbox fee that scales linearly with headcount, and your mail, contacts, and calendar live on Google's infrastructure subject to scanning and policy changes. Teams that want to own their data, escape per-seat billing, or keep mail on their own domain and hardware are the ones who leave.

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Our picks at a glance

Easiest to self-host
mailcow: dockerized

At difficulty 3/5 it ties Mailu for the lowest self-host difficulty here and ships a full stack (webmail, antispam, admin UI) via Docker Compose out of the box.

Most powerful
mailcow: dockerized

The most feature-complete dockerized full stack, bundling SOGo webmail, Rspamd, ClamAV, and a polished admin UI as a self-hosted Gmail replacement.

Most active
docker-mailserver

Highest momentum in this category at 18,400 stars, well ahead of mailcow's 12,900.

Best managed option
Forward Email

The only option here offering official managed hosting (managed:yes), aimed at users who want a privacy-focused service without running the server themselves.

Compare all 14 alternatives

ProjectDeployManagedLicense
docker-mailserver
Shell
19k ★
4/5
Involved
Docker
Docker Compose
+1
MIT12 days agoRepo
Mail-in-a-Box
Shell
15k ★
2/5
Easy
Manual
CC0-1.02 months agoRepo
Stalwart Mail Server
Rust
14k ★
3/5
Moderate
Docker
Docker Compose
+1
AGPL-3.03 days agoRepo
mailcow: dockerized
PHP
13k ★
3/5
Moderate
Docker Compose
Manual
GPL-3.04 days agoRepo
Mailu
Python
7.4k ★
3/5
Moderate
Docker Compose
Kubernetes
+1
MIT3 days agoRepo
SimpleLogin
Docker
6.9k ★
3/5
Moderate
Docker
Docker Compose
+1
MIT3 days agoRepo
Maddy Mail Server
Go
6k ★
4/5
Involved
Docker
Manual
GPL-3.06 days agoRepo
Mox
Go
5.8k ★
3/5
Moderate
Manual
MIT10 days agoRepo
AnonAddy
PHP
4.8k ★
4/5
Involved
Docker
Docker Compose
+1
MIT15 days agoRepo
Modoboa
Python
3.5k ★
4/5
Involved
Docker
Manual
ISC6 days agoRepo
wildduck
Nodejs
2.1k ★
5/5
Advanced
Docker
Manual
EUPL-1.23 days agoRepo
iRedMail
Shell
1.8k ★
3/5
Moderate
Manual
GPL-3.08 days agoRepo
Forward Email
JavaScript
1.6k ★
5/5
Advanced
Manual
BUSL-1.13 days agoRepo
Sympa
Perl
310 ★
4/5
Involved
Manual
GPL-2.022 days agoRepo

What to look for: Running mail yourself means reliable deliverability (SPF, DKIM, DMARC, and a clean sending IP with proper reverse DNS) and ongoing spam/antivirus maintenance, so favor a stack that bundles these rather than leaving you to wire up Postfix and Dovecot by hand. Decide up front whether you want a single all-in-one container or a modular set of images, and confirm the project supports the IMAP/SMTP clients and webmail you actually need.

Head-to-head:docker-mailserver vs Gmail / Google WorkspaceMail-in-a-Box vs Gmail / Google WorkspaceStalwart Mail Server vs Gmail / Google Workspacemailcow: dockerized vs Gmail / Google WorkspaceMailu vs Gmail / Google Workspace

The alternatives, reviewed

  1. #1
    docker-mailserver
    Self-host: Involved

    Production-ready, config-driven mail server in a single container

    19k Shell MIT 12 days ago
    How it compares to Gmail / Google Workspace
    • No admin web UI — all config is via files and the CLI
    • No bundled webmail or groupware (calendar/contacts)
    • Deliverability, DNS, and TLS setup are entirely your responsibility
    • Not a newsletter/marketing tool — mailboxes only
    RepoDetails & deploy →
  2. #2
    Mail-in-a-Box
    Self-host: Easy

    Turn any Ubuntu VPS into a complete, self-hosted mail server in one command

    15k Shell CC0-1.0 2 months ago
    How it compares to Gmail / Google Workspace
    • Requires a dedicated Ubuntu VPS with a clean IP reputation; shared hosting is not supported
    • No built-in bulk mailing or newsletter campaign tools
    • Limited horizontal scalability; single-server architecture only
    • Webmail (Roundcube) is functional but far less polished than Gmail's UI
    RepoDetails & deploy →
  3. #3
    Stalwart Mail Server
    Self-host: Moderate

    Modern all-in-one mail server with JMAP, IMAP4, and SMTP in a single Rust binary

    14k Rust AGPL-3.0 3 days ago
    How it compares to Gmail / Google Workspace
    • No built-in newsletter/broadcast campaign tooling
    • Web admin UI is functional but less refined than commercial email service dashboards
    • Third-party anti-virus (ClamAV) integration requires additional setup
    • Community support only on the free tier; paid support plans are limited
    RepoDetails & deploy →
  4. #4
    mailcow: dockerized
    Self-host: Moderate

    Dockerized full-stack mail server, a self-hosted Gmail alternative

    13k PHP GPL-3.0 4 days ago
    How it compares to Gmail / Google Workspace
    • Requires a dedicated server with proper DNS/PTR and good IP reputation
    • Not a bulk-newsletter tool — focused on mailboxes, not campaigns
    • Ongoing maintenance, updates, and spam tuning are on you
    • Resource-hungry; needs a few GB of RAM minimum
    RepoDetails & deploy →
  5. #5
    Mailu
    Self-host: Moderate

    Simple yet full-featured mail server as a set of Docker images

    7.4k Python MIT 3 days ago
    How it compares to Gmail / Google Workspace
    • No calendar/contacts groupware bundled by default
    • Requires correct DNS, PTR, and IP reputation to deliver reliably
    • Focused on mailboxes, not newsletters or marketing campaigns
    • Upgrades occasionally require manual migration steps
    RepoDetails & deploy →
  6. #6
    SimpleLogin
    Self-host: Moderate

    Self-hostable email alias service to protect your real address from spam and tracking

    6.9k Docker MIT 3 days ago
    How it compares to Gmail / Google Workspace
    • Self-hosted instance requires managing its own MX record and email reputation
    • No bulk sending or newsletter features; purely an alias/forwarding tool
    • Mobile apps connect to SimpleLogin's cloud by default; redirecting to self-hosted requires manual app configuration
    • Spam filtering is inherited from the destination mailbox, not provided independently
    RepoDetails & deploy →
  7. #7
    Maddy Mail Server
    Self-host: Involved

    Single-binary Go mail server replacing Postfix, Dovecot, OpenDKIM, and OpenDMARC

    6k Go GPL-3.0 6 days ago
    How it compares to Gmail / Google Workspace
    • No webmail interface; users need a separate IMAP client
    • Documentation is less comprehensive than established stacks like Postfix + Dovecot
    • No built-in web admin panel for managing accounts
    • Smaller ecosystem and community compared to traditional mail server components
    RepoDetails & deploy →
  8. #8
    Mox
    Self-host: Moderate

    Complete, modern self-hosted email server with JMAP, DANE, and built-in junk filtering

    5.8k Go MIT 10 days ago
    How it compares to Gmail / Google Workspace
    • No Docker image provided officially; manual binary deployment only
    • Not designed for high-volume transactional or bulk email sending
    • Admin UI and webmail are functional but lack polish compared to hosted solutions
    • Relatively young project; some edge-case RFC compliance gaps may exist
    RepoDetails & deploy →
  9. #9
    AnonAddy
    Self-host: Involved

    Self-hosted anonymous email forwarding with unlimited disposable aliases

    4.8k PHP MIT 15 days ago
    How it compares to Gmail / Google Workspace
    • Requires a properly configured Postfix MTA alongside the application, increasing setup complexity
    • No newsletter or campaign functionality; alias forwarding only
    • Mobile apps point to anonaddy.com by default; self-hosted URL must be configured manually
    • No built-in spam filtering beyond what the upstream MTA provides
    RepoDetails & deploy →
  10. #10
    Modoboa
    Self-host: Involved

    Web-based mail hosting platform with modern UI for managing domains and accounts

    3.5k Python ISC 6 days ago
    How it compares to Gmail / Google Workspace
    • Still depends on external Postfix and Dovecot daemons; not truly all-in-one
    • Webmail plugin (Rainloop/SOGo) requires separate configuration
    • No bulk mailing or newsletter campaign features
    • Documentation can be incomplete for advanced plugin setups
    RepoDetails & deploy →
  11. #11
    wildduck
    Self-host: Advanced

    Scalable, horizontally distributed IMAP/POP3 mail server with no single point of failure

    2.1k Nodejs EUPL-1.2 3 days ago
    How it compares to Gmail / Google Workspace
    • No built-in web admin UI; management is done through a JSON HTTP API only
    • SMTP is a separate component (Haraka/ZoneMTA) requiring additional setup
    • MongoDB dependency adds operational overhead compared to simpler SQL-backed servers
    • Documentation assumes strong Node.js and MongoDB expertise
    RepoDetails & deploy →
  12. #12
    iRedMail
    Self-host: Moderate

    Full-featured open-source mail server built on Postfix and Dovecot, installable in minutes

    1.8k Shell GPL-3.0 8 days ago
    How it compares to Gmail / Google Workspace
    • Full admin panel (iRedAdmin-Pro) requires a paid license; free admin panel is limited
    • Designed for dedicated servers only; Docker or container-based installs are unofficial
    • No built-in newsletter or bulk email campaign features
    • Upgrades between major versions require careful manual steps
    RepoDetails & deploy →
  13. #13
    Forward Email
    Self-host: Advanced

    Privacy-focused email service, an all-in-one Gmail and SaaS alternative

    1.6k JavaScript BUSL-1.1 3 days ago
    How it compares to Gmail / Google Workspace
    • Self-hosting is complex and far less documented than the hosted service
    • Newsletter/campaign tooling is thin compared to Mailchimp
    • BUSL-1.1 license is source-available, not fully OSI-open
    • Running production email requires significant infra and DNS expertise
    RepoDetails & deploy →
  14. #14
    Sympa
    Self-host: Involved

    Scalable multilingual mailing list manager for large organizations

    310 Perl GPL-2.0 22 days ago
    How it compares to Gmail / Google Workspace
    • Perl stack and complex config make setup challenging
    • No modern marketing analytics or A/B testing
    • Web UI is functional but not modern by current standards
    RepoDetails & deploy →

The verdict

For most teams self-hosting business email, mailcow is the best balance of completeness and approachability; pick docker-mailserver if you prefer a leaner single-container, config-driven setup, or Forward Email if you'd rather not operate the server at all.

Still deciding? Compare docker-mailserver vs Mail-in-a-Box side by side →

Gmail / Google Workspace alternatives — frequently asked questions

Is there a free open-source Gmail alternative I can self-host?

Yes. docker-mailserver (MIT) and Mailu (MIT) are both free and permissively licensed, and mailcow (GPL-3.0) is free and open source as well. All three run on your own hardware via Docker.

Which self-hosted mail server is easiest to set up?

mailcow and Mailu are the most approachable at difficulty 3/5, both deploying via Docker Compose with batteries included. docker-mailserver is slightly harder at 4/5, and Forward Email is the most involved at 5/5.

Do any of these offer managed hosting instead of self-hosting?

Only Forward Email offers an official managed service. mailcow, Mailu, and docker-mailserver are self-host only, so you provide the server and handle operations yourself.

Which has the most community momentum?

docker-mailserver leads with 18,400 stars, followed by mailcow at 12,900 and Mailu at 7,300.

Will my email actually be delivered if I run my own server?

It can, but deliverability is the hard part of self-hosting mail. All of these expect you to configure SPF, DKIM, and DMARC and use an IP with good reputation; mailcow and Mailu bundle Rspamd-based spam filtering to help on the inbound side.

Can I use a normal email client with these?

Yes. docker-mailserver, mailcow, and Mailu are standard IMAP/SMTP servers, so Thunderbird, Apple Mail, and mobile clients work; mailcow and Mailu also include webmail.

Keep exploring

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