James - Enterprise Mail Server

•    Java

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James (a.k.a Java Apache Mail Enterprise Server) is a 100% pure Java SMTP and POP3 Mail server, and NNTP News server designed to be a complete and portable enterprise mail/messaging engine solution based on currently available open messaging protocols.

mail-server email-server enterprise mailing-list smtp lmtp pop3 nntp imap mta mail-delivery-agent

deepOfix - Mail Server

•    C

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The deepOfix Mail Server makes it possible for organisations with minimal technical expertise to have robust messaging infrastructure. It has built in LDAP support, SMTP, POP3 and IMAP services.

mail mail-server smtp pop3

Dovecot - Secure IMAP and Pop3 server for Linux

•    C

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Dovecot is an open source IMAP and POP3 email server for Linux or UNIX-like systems written with security primarily in mind. Dovecot is an excellent choice for both small and large installations. It is fast, simple to set up, requires no special administration and it uses very little memory. Dovecot is NOT responsible for receiving mail from other servers. Dovecot presents mail already stored on the system to mail-user agents [MUA].

imap pop3 smtp pop3-server imap-server email

Citadel

•    C

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Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.

mail-server groupware bulletin-board mailing-list wiki instant-messaging smtp pop3

ClearOS - Linux based Operating System

•    C

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ClearOS is a powerful network and gateway server designed for small organizations and distributed environments. The open source revolution in the software industry has made it possible to provide ClearOS at no cost. Among other features, antivirus, antispam, VPN and content filtering are built right into the software -- no need for expensive third party add-ons. With ClearOS, you can avoid costly vendor lock-in and proprietary formats; instead, you can embrace open standards and protocols.

os operating-system linux-operating-system server-os linux-firewall

SharpWebMail - ASP.NET Webmail Application

•    CSharp

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SharpWebMail is an ASP.NET webmail application that is written in C#. It uses a POP3 or IMAP servers as the mailstore and sends mail through a SMTP server. It is very simple to configure (only a few settings in the web.config file). You can compose HTML messages, search your inbox, read complex mime messages, have multiple address books and much more.

webmail web-mail smtp mail-client pop3 imap mail-store

Zimbra - Email and Collaboration Suite

•    Java

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Zimbra is the most capable open source email and collaboration suite available today. It provides support for Email, Shared calendar, Document management, Pop3, Address book and lot more. Mails could be tagged and search support is also provided. Zimbra is considered as an alternative to Microsoft Exchange Server.

mail-server groupware instant-messaging smtp pop3 imap document-management dms

Claws Mail - Email Client and News Reader Based on GTK+

•    C

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Claws Mail is a GTK+ based, lightweight, and fast e-mail client and newsreader. Supports POP3, APOP, IMAP, SMTP, SMTP AUTH, NNTP, LDAP, multiple accounts, spell-checking, addressbook, SSL, GPG, filtering, i18n, & more. It is further extended by plugins. Lots of extra functionality, like an RSS aggregator, calendar, or laptop LED handling, are provided by extra plugins.

mail-client email-client mail pop3 smtp client newsreader rss-aggregator

Courier Mail Server

•    C

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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, calendaring, and mailing list services.

PyWebMail

•    Python

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PyWebMail is a Python library and POP3 gateway that enable working with WebMail servers like with POP3 or IMAP mail server. Currently Mail.Com, Yahoo! Mail, Gmail, Netscape.Net, HotMail and some minor servers support is finished.

JavaMail - Java library to build Mail and Messaging Applications

•    Java

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The JavaMail API is a set of abstract APIs that model a mail system. The API provides a platform independent and protocol independent framework to build Java technology based email client applications. The JavaMail API provides facilities for reading and sending email. Service providers implement particular protocols. Several service providers are included with the JavaMail API package; others are available separately.

email-library mail-library smtp-library pop3-library imap-library mail smtp imap pop3

YPOPs! - POP3/SMTP Access to Yahoo

•    C++

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YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo's POP3/SMTP mail server. You can use a mail client of your choice!

docker-mailserver - A fullstack but simple mailserver (smtp, imap, antispam, antivirus, ssl

•    Shell

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A fullstack but simple mail server (smtp, imap, antispam, antivirus...). Only configuration files, no SQL database. Keep it simple and versioned. Easy to deploy and upgrade. Before you open an issue, please have a look this README, the Wiki and Postfix/Dovecot documentation.

docker mailserver mail postfix dovecot spamassassin amavis opendkim opendmarc ldap fail2ban ssl letsencrypt postgrey imap smtp

Mailu - Insular email distribution - mail server as Docker images

•    Python

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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. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware. Most of the documentation is available on our Website, you can also try our demo server before setting up your own, and come talk to us on Matrix.

docker email imap pop3 webmail mailserver mail smtp docker-compose dkim dmarc fetchmail letsencrypt

FedMail Mail Transfer Agent

•    C++

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Modular EMail Server with features to support SMTP-after-POP,Anti-Virus filter by using popular AV-Scanners,IMAP,POP3,SSL,ODMR,SASL and has an easy configuration. (SMTP,ODMR,IMAP,POP3,SASL,CHUNKING,BINARYMIME,PAM)

P3SS (Pop3 to SMTP Server)

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A Pop 3 to SMTP connector that supports Encryption (implicit/explicit SSL/TLS), APOP and leaving\deleting messages on the server after collection. P3SS is built as a windows service that logs errors to the Windows Event Log and is coded in C# 3.5.

exchange exchange-connector pop3 pop3-connector smtp windows-server

C# Email Server - SMTP and POP3 Email Server in CSharp

•    CSharp

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C# Email Server (CES). Implements SMTP and POP3 components that can be used as a standalone server or as components in other applications. It is a port of the Java Email Server (JES). This component allows a program to accept incoming emails and process them using user defined logic.

smtp-server smtp pop3 mail-server email-server email

CRSMail - JAVA based E-Mail server

•    Java

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CRSMail a 100% JAVA based E-Mail server. It supports SMTP, POP3, Plugins, Can listen on multiple ports, Log's everything to a log file etc.

smtp-server smtp pop3 mail-server email-server email

Postfix - Mail Server

•    C

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Postfix is mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different. It supports IPv6, DKIM, DomainKeys and SenderID authentication, SPF, Sendmail Milter (mail filter) protocol, Zombie blocker, TLS encryption, LDAP and it supports database like MySQL, PostgreSQL, Berkeley DB, Memcache.

mail mail-server smtp pop3 nntp mta mail-transfer-agent

Piranha Mail

•    PHP

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Piranha Mail is a powerful POP3/IMAP/SMTP to Web/WAP gateway.