listmonk
Mail ServersSelf-hosted newsletter and mailing list manager
Replaces Mailchimp, Sendinblue
Best Multi-User Mail Servers for self-hosting
The 54 best Multi-User mail servers you can self-host, ranked by community traction.
Docker Mailserver
Mail ServersProduction-ready, config-driven mail server in a container
Replaces Google Workspace, Microsoft 365
Postal
Mail ServersComplete mail delivery platform for outgoing email
Replaces SendGrid, Mailgun
Mail-in-a-Box
Mail ServersTurn a fresh server into a working mail server
Replaces Google Workspace, Microsoft 365
mailcow
Mail ServersDockerized full-stack mail server suite
Replaces Microsoft Exchange, Google Workspace
Mautic
Mail ServersOpen-source marketing automation platform
Replaces HubSpot, Marketo
Mailu
Mail ServersSimple yet full-featured Docker mail server
Replaces Google Workspace, Microsoft 365
Roundcube
Mail ServersBrowser-based IMAP webmail client
Replaces Gmail, Outlook Web
SimpleLogin
Mail ServersOpen source email alias solution to protect your email address
Maddy Mail Server
Mail ServersComposable, all-in-one mail server in Go
Replaces Google Workspace, Microsoft 365
Mox
Mail ServersModern, secure all-in-one mail server
Replaces Google Workspace, Microsoft 365
Mailtrain
Mail ServersSelf-hosted newsletter application
Replaces Mailchimp
AnonAddy
Mail ServersEmail forwarding service for creating aliases
Modoboa
Mail ServersMail hosting and management platform with a modern UI
Replaces Google Workspace, cPanel Email
Dittofeed
Mail ServersOmni-channel customer engagement and messaging automation platform
Keila
Mail ServersOpen-source newsletter tool for senders
Replaces Mailchimp, Sendinblue
SendPortal
Mail ServersSelf-hosted email marketing and newsletter platform
Replaces Mailchimp
emailwiz
Mail ServersScript to deploy a full Postfix/Dovecot mail server
Replaces Google Workspace
WildDuck
Mail ServersScalable IMAP and POP3 mail server with REST API
Replaces Microsoft Exchange, Gmail
iRedMail
Mail ServersFree, full-featured mail server solution
Replaces Microsoft Exchange, Google Workspace
Cypht
Mail ServersLightweight webmail aggregator for many accounts
Replaces Gmail, Outlook Web
SnappyMail
Mail ServersLightweight, fast and modern webmail client
Replaces Gmail, Outlook Web
Forward Email
Mail ServersPrivacy-focused encrypted email for everyone
Cuttlefish
Mail ServersTransactional email server with click and open tracking
Replaces Mailgun, SendGrid
DebOps
Mail ServersYour Debian-based data center in a box
Dovecot
Mail ServersSecure, high-performance IMAP and POP3 server
Replaces Microsoft Exchange
PostfixAdmin
Mail ServersWeb interface for managing Postfix mail domains
Replaces cPanel Email
Apache James
Mail ServersEnterprise mail server and SMTP/IMAP platform
Replaces Microsoft Exchange
Nextcloud Mail
Mail ServersIMAP webmail client integrated into Nextcloud
Replaces Gmail
chasquid
Mail ServersSimple, easy-to-configure SMTP server
Replaces Google Workspace
OpenTrashmail
Mail ServersComplete trashmail solution that exposes an SMTP server and has a web
phpList
Mail ServersNewsletter and email marketing with advanced management
alps
Mail ServersSimple and extensible web-based email client
Replaces Gmail
Cyrus IMAP
Mail ServersScalable IMAP and POP server for large deployments
Replaces Microsoft Exchange
Postfix
Mail ServersFast, secure and reliable mail transfer agent
Replaces Microsoft Exchange
ViMbAdmin
Mail ServersWeb interface for managing virtual mail domains
Replaces cPanel email
Mailman
Mail ServersFree software for managing electronic mailing lists
Replaces Google Groups
Afterlogic WebMail Lite
Mail ServersFree webmail front-end for IMAP and SMTP servers
Replaces Gmail, Outlook Web
Sympa
Mail ServersScalable mailing list management software
Replaces Google Groups
Simple NixOS Mailserver
Mail ServersComplete mailserver solution leveraging the Nix Ecosystem
HyperKitty
Mail ServersWeb archive interface for Mailman 3 mailing lists
Replaces Google Groups
Postorius
Mail ServersWeb administration interface for Mailman 3
Replaces Google Groups
piler
Mail ServersEmail archiving system with full-text search
Replaces Mimecast, Barracuda Archiver
Schleuder
Mail ServersEncrypting mailing list manager with OpenPGP
Replaces Google Groups
Dovecot Pigeonhole
Mail ServersSieve mail filtering engine for Dovecot
Replaces Gmail filters
Courier Mail Server
Mail ServersIntegrated mail server with IMAP, POP, and webmail
Replaces Microsoft Exchange
Afterlogic DAV
Mail ServersCalDAV and CardDAV server for Afterlogic WebMail
Replaces Microsoft Exchange Web Access
Dovel
Mail ServersSMTP server that sends and receives emails according to a simple
b1gMail
Mail ServersComplete email solution that runs on any webspace with PHP and MariaDB
Inboxen
Mail ServersLets you have an infinite number of unique inboxes
SquirrelMail
Mail ServersAnother browser-based IMAP client
EmailRelay
Mail ServersA small and easy to configure SMTP and POP3 server for Windows
Sendy
Mail ServersSelf-hosted email newsletter application that lets you send bulk
Sendmail
Mail ServersMessage transfer agent (MTA)
No apps match these filters.
At a glance
| App | Deploy effort | Difficulty | Min. RAM | License | ★ Stars |
|---|---|---|---|---|---|
| listmonk | Under-an-hour setup | Easy | 512 MB | AGPL-3.0 | 23,776 |
| Docker Mailserver | ≈5-minute setup | Medium | 2,048 MB | MIT | 19,533 |
| Postal | Under-an-hour setup | Hard | 2,048 MB | MIT | 16,862 |
| Mail-in-a-Box | ≈5-minute setup | Easy | 1,024 MB | CC0-1.0 | 15,438 |
| mailcow | Under-an-hour setup | Medium | 6,144 MB | GPL-3.0 | 13,610 |
| Mautic | Under-an-hour setup | Hard | 2,048 MB | GPL-3.0 | 10,760 |
| Mailu | Under-an-hour setup | Medium | 2,048 MB | MIT | 7,551 |
| Roundcube | Under-an-hour setup | Easy | 256 MB | GPL-3.0 | 7,217 |
| SimpleLogin | Under-an-hour setup | Medium | 512 MB | MIT | 7,049 |
| Maddy Mail Server | Under-an-hour setup | Medium | 256 MB | GPL-3.0 | 6,108 |
Quick picks
- Most adopted: listmonk (23,776 GitHub stars).
- Lightest footprint: alps (from 64 MB RAM, against 6,144 MB for the heaviest here).
- Fastest to deploy: Docker Mailserver (verified single-container compose).
- Licensing: 18 of 54 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 Multi-User within the mail servers category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.