Self-hostable software: Mail Transfer Agents (33)

A production-ready containerized mail server with SMTP, IMAP, LDAP, anti-spam, and anti-virus services.

Postal is a complete, self-hosted mail server for websites and web servers.

A one-click, easy-to-deploy mail server appliance for self-hosting email on Ubuntu.

BillionMail is an open-source mail server and email marketing platform for sending newsletters, promotional emails, and transactional messages.

Stalwart is an open-source mail and collaboration server with support for IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV.

mailcow: dockerized is a self-hosted mail server suite deployed with Docker.

Mailu is a Docker-based mail server suite that provides IMAP, SMTP, webmail, and administration features.

A composable all-in-one mail server that handles SMTP sending and receiving, IMAP storage, and related email security protocols.

Mox is an open source self-hosted email server with SMTP, IMAP, webmail, and a web admin interface.

Haraka is a highly scalable Node.js SMTP server with a modular plugin architecture.

Self-hostable anonymous email forwarding service for creating aliases and forwarding mail to your real inbox.

Modoboa is a mail hosting and management platform with a web user interface, administration panel, and webmail.