Apps similar to Mail-in-a-box include mailcow: dockerized, which is free and open source. Other options are Cloudron, Cloud Mail, Postfix and Nexmail. You can choose from more than 10 Mail Servers like Mail-in-a-box for self-hosting, Linux, Mac, Windows and the web.
Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer and as in free speech), open to suggestions and external contributions.
Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
United States
Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.
WildDuck is a scalable no-SPOF IMAP/POP3 mail server. WildDuck uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails.
A lightweight mail server with SMTP and POP3 support. It mainly used as store-and-forward mail server with POP access to spooled messages or it can be used as a personal internet mail server.
inbuxa is a JMAP-first mail and collaboration server: JMAP, CalDAV, CardDAV and WebDAV in one binary, with IMAP, POP3 and ManageSieve supported until you switch them off. It ships with its own administration console and webmail, installed together as one suite.
United States
Vietnam
Mox is a modern full-featured open source secure mail server for low-maintenance self-hosted email.
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
