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mailez-hq

mailez-hq/mailez

Self-hosted mail server for your own domain, with SMTP/IMAP/POP3, CardDAV/CalDAV, a React webmail and admin console, deployed via Docker Compose.

Open-source alternative to:GmailMicrosoft Outlook

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286
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22
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1
Last commit
6 days ago

What is it?

mailez is a self-hosted mail system for running email on your own domain, from a personal mailbox to organizations with thousands of users. It covers mail delivery, spam filtering, authentication, an admin console and a webmail client, and is deployed with a single Docker Compose command.

The server speaks SMTP, IMAP, POP3 and ManageSieve, with CardDAV and CalDAV for contacts and calendars on phones and desktops. Its webmail includes a three-pane inbox, conversation threads, a Sieve filter editor, PGP sign and encrypt, two-factor authentication, and a Drive for files. Calendar subscriptions can be added to Apple Calendar or Google Calendar, and a Delta Chat login QR is available in settings.

The admin console manages domains, mailboxes, aliases and relays, and includes one-click DKIM key generation and a health page that checks MX, SPF, DMARC, DKIM, blocklists, MTA-STS and certificate expiry. The stack uses Go for the backend, Next.js for the frontend and a Go mail engine called mailezine, with SQLite by default and optional MySQL or PostgreSQL.

Key features

  • 01Full mail stack with SMTP, IMAP, POP3 and ManageSieve support
  • 02CardDAV and CalDAV sync for contacts and calendars
  • 03React webmail with conversation view, search operators and keyboard shortcuts
  • 04Admin console for domains, mailboxes, aliases, DKIM and domain health checks
  • 05One-command deployment with Docker Compose

Use cases

  • Running company email on your own domain with data kept in-house
  • Hosting a private mailbox instead of renting one from a mail provider
  • Public-sector or regulated organizations with data-sovereignty requirements
  • Setting up a self-hosted mail server without deep Linux mail expertise

Quick start

  1. 1

    Clone mailez and mailezine side by side

    git clone …/mailez && git clone …/mailezine
  2. 2

    Pre-create data directory on Linux hosts

    mkdir -p deploy/data && sudo chown -R 1000:82 deploy/data
  3. 3

    Start the dev tier

    ./deploy/mailezctl.sh up
  4. 4

    Provision the admin account inside the backend container

    docker compose --env-file deploy/mailez.env -f deploy/docker-compose.ce.yml exec backend mailez-seed

Things to know

  • Needs a sibling mailezine checkout and Docker to build and run.
  • Requires a mail server setup with DNS, ports 25/465/587 and TLS certificates for production use.
  • Licensed AGPL-3.0, so modified network-served versions must be open-sourced unless you buy a commercial license.

Topics

#email#mail-server#self-hosted#imap#smtp#webmail#caldav#docker-compose#admin-console#carddav

FAQ

What is mailez?
Self-hosted mail server for your own domain, with SMTP/IMAP/POP3, CardDAV/CalDAV, a React webmail and admin console, deployed via Docker Compose. mailez is a self-hosted mail system for running email on your own domain, from a personal mailbox to organizations with thousands of users. It covers mail delivery, spam filtering, authentication, an admin console and a webmail client, and is deployed with a single Docker Compose command.
Is mailez free to use? What license does it have?
mailez is open source under the AGPL-3.0 license. Check the license terms before using it in commercial products.
Is mailez still maintained?
Actively maintained. The last commit to mailez was on Oct 14, 2026.
What can I use mailez for?
Running company email on your own domain with data kept in-house Hosting a private mailbox instead of renting one from a mail provider Public-sector or regulated organizations with data-sovereignty requirements Setting up a self-hosted mail server without deep Linux mail expertise
How do I install mailez?
Clone mailez and mailezine side by side: git clone …/mailez && git clone …/mailezine Pre-create data directory on Linux hosts: mkdir -p deploy/data && sudo chown -R 1000:82 deploy/data Start the dev tier: ./deploy/mailezctl.sh up Provision the admin account inside the backend container: docker compose --env-file deploy/mailez.env -f deploy/docker-compose.ce.yml exec backend mailez-seed
Where can I get mailez?
The source code and installation instructions are on GitHub: https://github.com/mailez-hq/mailez

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