Gmail
Email service with spam protection and Google integration
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Discover top open-source software, updated regularly with real-world adoption signals.
Fully featured Docker‑based mail server that's simple to deploy
Mailu delivers a complete email solution—IMAP, SMTP, webmail, anti‑spam, TLS, DKIM, and admin UI—all packaged as Docker images for quick setup and easy maintenance.
Mailu is a self‑hosted email platform designed for teams and organizations that want full control over their communications without relying on proprietary services. It bundles all essential mail components—IMAP/IMAP+, SMTP, submission, webmail, and an administration console—into a cohesive Docker‑compose stack.
The solution supports standard protocols with auto‑configuration profiles, advanced features such as aliases, domain delegation, full‑text attachment search, and managesieve filtering. Security is baked in: enforced TLS, DANE, MTA‑STS, automatic Let’s Encrypt certificates, outgoing DKIM signing, and integrated anti‑virus scanning. Anti‑spam measures include greylisting, SPF/DKIM/DMARC validation, auto‑learned filters and attachment blocking.
Deploying Mailu requires only Docker and Docker‑compose. A single configuration file defines the mail services, database, and optional components, allowing rapid spin‑up on any host or cloud instance. Updates are handled by pulling newer images, and the entire stack remains fully open source under the MIT license.
When teams consider Mailu, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
Deploy a company mail system in minutes
Launch IMAP/SMTP services with webmail and admin UI using a single docker‑compose file.
Provide secure email for a development team
Enable automatic TLS, DKIM signing, and anti‑spam filters without external services.
Run a multi‑domain mail service for a hosting provider
Manage separate domains, aliases, quotas, and per‑domain delegation from the admin console.
Integrate email fetching from external accounts
Configure fetched accounts and managesieve rules to consolidate external mail into the Mailu server.
Any recent Docker engine that supports docker‑compose (Docker 20.x or newer) works with Mailu.
Mailu can automatically request and renew Let’s Encrypt certificates when the feature is enabled.
The stack ships with multiple webmail options such as Roundcube and Rainloop, selectable via configuration.
Mailu combines greylisting, SPF/DKIM/DMARC checks, auto‑learned filters, and optional antivirus scanning to reduce unwanted mail.
Project at a glance
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