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

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

Mailu - Mail server as a set of Docker images

•    Python

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Mailu is a simple yet full-featured mail server as a set of Docker images. 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.

docker email imap pop3 webmail mailserver mail smtp docker-compose dkim dmarc fetchmail letsencrypt email-server mail-server self-hosted ldap

Docker Mailserver - A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker.

•    Shell

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A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.). Only configuration files, no SQL database. Keep it simple and versioned. Easy to deploy and upgrade.

letsencrypt docker ssl ldap mail postfix imap smtp dovecot spamassassin antivirus fail2ban antispam mailserver opendkim amavis postgrey opendmarc docker-mailserver saslauthd-ldap smtp-server email-server mail-server

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

WildDuck Mail Server - Self hosted modern mail server `

•    Javascript

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WildDuck is a modern mail server software for IMAP and POP3. Modern being scalable, unicode-first and API-controlled. You can bundle WildDuck with Haraka and ZoneMTA to create a complete mail server. It uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails. It tries to follow Gmail in product design. If there's a decision to be made then usually the answer is to do whatever Gmail has done.

mail-server email-server pop3 imap docker smtp-server smtp imap-server pop3-server self-hosted

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

DavMail - POP/IMAP/SMTP/Caldav to Exchange

•    Java

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DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. DavMail now includes an LDAP gateway to Exchange global address book and user personal contacts to allow recipient address completion in mail compose window and full calendar support with attendees free/busy display.

smtp-server mail-server gateway exchange-gateway pop3 imap ldap caldav carddav

hMailServer - E-Mail Server for Microsoft Windows.

•    C++

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hMailServer is an open source email server for Microsoft Windows. It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email.

email-server mail-server smtp-server imap pop3

fetchmail - TLS-enabled mail retrieval and forwarding agent

•    C

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Fetchmail is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP2, POP3, RPOP, APOP, KPOP, all flavors of IMAP, ETRN, and ODMR. It can even support IPv6 and IPSEC.

mail-client mail retrieval mail-forward relay command-line email smtp pop3 imap

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

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.

MailKit - A cross-platform .NET library for IMAP, POP3, and SMTP.

•    CSharp

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MailKit is a cross-platform mail client library built on top of MimeKit.The main goal of this project is to provide the .NET world with robust, fully featured and RFC-compliant SMTP, POP3, and IMAP client implementations.

c-sharp email mime parser mime-parser dkim pgp smime smtp imap pop3 client

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)

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!

MailCore 2 - Simple and asynchronous API to work with e-mail protocols IMAP, POP and SMTP

•    C++

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MailCore 2 provides a simple and asynchronous Objective-C API to work with the e-mail protocols IMAP, POP and SMTP. The API has been redesigned from the ground up.

imap smtp pop3 mail-sync synchronization

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

Openmeetings - Open Source Web Conferencing

•    Java

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Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming. Meeting can be recorded and screen sharing support is also available.

web-conferencing meetings conference video-conference instant-messaging streaming desktop-sharing

LogicalDOC Document Management - DMS

•    Java

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LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.

dms document-management document collaboration workflow groupware knowledge-management