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Best LDAP Mail Servers for self-hosting

The 9 best LDAP mail servers you can self-host, ranked by community traction.

Docker Mailserver

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

Replaces Google Workspace, Microsoft 365

★ 19.5k Medium setup MIT

mailcow

Dockerized full-stack mail server suite

Replaces Microsoft Exchange, Google Workspace

★ 13.6k Medium setup GPL-3.0

Roundcube

Browser-based IMAP webmail client

Replaces Gmail, Outlook Web

★ 7.2k Easy setup GPL-3.0

Modoboa

Mail hosting and management platform with a modern UI

Replaces Google Workspace, cPanel Email

★ 3.5k Medium setup ISC

iRedMail

Free, full-featured mail server solution

Replaces Microsoft Exchange, Google Workspace

★ 1.8k Medium setup GPL-3.0

Dovecot

Secure, high-performance IMAP and POP3 server

Replaces Microsoft Exchange

★ 1.3k Hard setup MIT

Cyrus IMAP

Scalable IMAP and POP server for large deployments

Replaces Microsoft Exchange

★ 652 Hard setup BSD-3-Clause

Sympa

Scalable mailing list management software

Replaces Google Groups

★ 318 Hard setup GPL-2.0

Courier Mail Server

Integrated mail server with IMAP, POP, and webmail

Replaces Microsoft Exchange

★ 13 Hard setup GPL-3.0

At a glance

App	Deploy effort	Difficulty	Min. RAM	License	★ Stars
Docker Mailserver	≈5-minute setup	Medium	2,048 MB	MIT	19,533
mailcow	Under-an-hour setup	Medium	6,144 MB	GPL-3.0	13,610
Roundcube	Under-an-hour setup	Easy	256 MB	GPL-3.0	7,217
Modoboa	Under-an-hour setup	Medium	2,048 MB	ISC	3,542
iRedMail	Read-the-docs project	Medium	4,096 MB	GPL-3.0	1,846
Dovecot	Under-an-hour setup	Hard	128 MB	MIT	1,263
Cyrus IMAP	Read-the-docs project	Hard	1,024 MB	BSD-3-Clause	652
Sympa	Under-an-hour setup	Hard	1,024 MB	GPL-2.0	318
Courier Mail Server	Read-the-docs project	Hard	512 MB	GPL-3.0	13

Quick picks

Most adopted: Docker Mailserver (19,533 GitHub stars).
Lightest footprint: Dovecot (from 128 MB RAM, against 6,144 MB for the heaviest here).
Fastest to deploy: Docker Mailserver (verified single-container compose).
Licensing: 4 of 9 use GPL-3.0; check the rest individually if you plan to modify and redistribute.

Every option here is open-source and self-hostable, tagged LDAP within the mail servers category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.

Keep exploring

All Mail Servers Easiest Mail Servers to self-host How to choose mail server: the Mail Servers buyer's guide

Head-to-head: LDAP mail servers