Email servers and webmail in 2026
5 commercial products, ranked by how many people read about each, or about its maker, on Wikipedia's mobile site. Of those with an article of their own, Gmail (Google Workspace) has the most readers, about 90k a month. 22 open-source projects, ranked by GitHub stars and how recently each was worked on. Docker Mailserver leads with 20k stars, ahead of Mailcow-dockerized. 17 had code pushed in the last three months. Most common licenses: MIT (7), AGPL-3.0 (6) and GPL-3.0 (5).
Commercial email servers and webmail
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1
Gmail (Google Workspace) Google
Stay on top of your inbox and keep your business safer with the secure, smart and easy-to-use Gmail.
Complete system Production-ready A business wants reliable hosted email with strong spam filtering and works mostly in the browser.
90k readers a month Since 2004 Commercial -
2
Proton Mail Proton AG
Proton Mail is the world’s largest secure email service with over 100 million users. Available on Web, iOS, Android, and desktop. Protected by Swiss privacy law.
Complete system Production-ready Privacy is your first concern and you want encrypted email, especially between Proton users.
12k readers a month Since 2014 Commercial -
3
Fastmail Fastmail Pty Ltd
Fast, private email hosting for you or your business. More productive, lightning fast, simple and built to save you time.
Complete system Production-ready An individual, family or small business wants fast, private email on its own domain without Google or Microsoft.
586 readers a month Since 1999 Commercial -
4
Microsoft Exchange Online Microsoft
Complete system Production-ready An organisation uses Outlook and Microsoft 365 and needs shared mailboxes, resource calendars and compliance controls.
Commercial -
5
Zoho Mail Zoho Corporation
Ad-free Business Email Hosting with a clean, easy-to-use interface. Secure & professional with integrated business Calendar, Contacts, Notes & Tasks.
Complete system Production-ready A small business wants low-cost email on its own domain, particularly if it uses other Zoho apps.
Commercial
New open-source projects
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1
OpenInbox sums001
Free, unlimited business email on your own domains, running entirely in your free Cloudflare account.
Complete system Experimental A small business already on Cloudflare wants free mailboxes for several domains and can tolerate beta software on a spare domain first.
★ 105 MIT TypeScript Active, pushed yesterday -
2
Mailez mailez-hq
Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.
Complete system Experimental You want an all-in-one mail server with modern webmail and are prepared to test a very new project thoroughly first.
★ 294 AGPL-3.0 Go Active, pushed 20 days ago -
3
OpenMail chenyuwebwawa
A self-hosted, open-source mail server suite in a single Node.js process — full-stack email with SMTP / IMAP / POP3, a modern three-pane webmail, an admin dashboard, multi-tenancy, DKIM, anti-spam and 2FA. Zero native dependencies, one SQLite file, up and running in minutes.
Complete system Experimental You want to experiment with a single-process mail server on a test domain.
★ 116 MIT JavaScript Active, pushed 13 days ago -
4
OmniMail mibgb65-cloud
Self-hosted multi-domain webmail on Cloudflare Workers, D1, R2, Queues, Email Routing, and Resend.
Complete system Experimental An individual or small team on Cloudflare wants serverless webmail for several domains without running a mail server.
★ 271 MIT TypeScript Active, pushed 17 days ago
Open-source email servers and webmail
Complete systems you can adopt 9
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1
Docker Mailserver docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
Complete system Production-ready You want a simple self-hosted mail server without a web admin panel.
★ 20k MIT Shell Active, pushed today -
2
Mailcow-dockerized mailcow
mailcow: dockerized - 🐮 + 🐋 = 💕
Complete system Production-ready You want to host email for several domains yourself with a full admin interface.
★ 14k GPL-3.0 JavaScript Active, pushed yesterday -
3
Roundcubemail roundcube
The Roundcube Webmail suite
Complete system Production-ready You run an IMAP server and need a dependable webmail front end.
★ 7.3k GPL-3.0 PHP Active, pushed 8 days ago -
4
WebClients ProtonMail
Monorepo hosting the proton web clients
Complete system Production-ready You want to audit or contribute to Proton's client code; to use Proton, sign up for the hosted service.
★ 5.7k GPL-3.0 TypeScript Active, pushed today -
5
Cypht cypht-org
Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)
Complete system Production-ready You want a lightweight self-hosted webmail that aggregates mailboxes from different providers.
★ 1.8k LGPL-2.1 PHP Active, pushed today -
6
MailFlow maathimself
A self-hosted, unified webmail client.
Complete system Usable You juggle several mail accounts and want one self-hosted web interface for them.
★ 628 AGPL-3.0 JavaScript Active, pushed today -
7
KumoMTA KumoCorp
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
Complete system Production-ready You send millions of emails and want an open alternative to commercial MTAs such as PowerMTA.
★ 571 Apache-2.0 Rust Active, pushed 4 days ago -
8
Webmail-lite-8 afterlogic
Open-source webmail script for existing IMAP server
Complete system Production-ready A host or small company wants a free webmail front end on its own IMAP server, maintained by a commercial vendor.
★ 363 AGPL-3.0 Shell Active, pushed 7 days ago -
9
Mailez mailez-hq
Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.
Complete system Experimental You want an all-in-one mail server with modern webmail and are prepared to test a very new project thoroughly first.
★ 294 AGPL-3.0 Go Active, pushed 20 days ago
Integrations 1
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1
Nextcloud Mail nextcloud
💌 Mail app for Nextcloud
Integration Production-ready Your team works in Nextcloud and wants email in the same interface as files and calendar.
★ 1.1k AGPL-3.0 JavaScript Active, pushed today
Compared head to head
Looking for an alternative to
Open-source licenses
- Permissive: 10. Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights.
- Network copyleft: 6. Like GPL, and running a changed version as a web service counts as distributing it, so its users get the source too.
- Strong copyleft: 5. If you distribute the program or anything built on it, you must release the whole source under the same license.
- Weak copyleft: 1. Changes to the licensed files must be shared, but you can link them into a closed program.
Languages
JavaScript 5, TypeScript 5, PHP 3, Go 3, Shell 2, Python 2, Rust 1 and C 1.
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