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

Hastymail - IMAP/SMTP client in PHP

•    PHP

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Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. It is compatible with PDAs, phones, text browsers, and all mainstream browsers. The ability to use a database for storing user settings, contacts, and plugin data, with support for both Postgresql and Mysql.

mail email-client webmail mail-client webmail-client web-mail imap-client

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

Cypht - Lightweight Open Source webmail written in PHP and JavaScript

•    PHP

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All your E-mail, from all your accounts, in one place. Cypht is not your father's webmail. Unless you are one of my daughters, in which case it is your father's webmail. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into one. And it's also a news reader..

webmail webmail-client imap pop3 smtp news-reader rss atom e-mail mail-client email-client

Mailpile - A free & open modern, fast email client with user-friendly encryption and privacy features

•    Python

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Mailpile (https://www.mailpile.is/) is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license. Mailpile places great emphasis on providing a clean, elegant user interface and pleasant user experience. In particular, Mailpile aims to make it easy and convenient to receive and send PGP encrypted or signed e-mail.

e-mail security pgp search-engine tags imap-client smtp-client

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

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

Roundcube Webmail - Browser-based multilingual IMAP client

•    PHP

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Roundcube Webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an email client, including MIME support, address book, folder management, message searching and spell checking.

imap impa-client webmail mail-client mail webmail-client web-mail

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

Mailspring - A beautiful, fast Webmail

•    Javascript

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Mailspring is built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email.

email mail electron osx electron-app imap webmail mail-client email-client

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

SquirrelMail - Webmail

•    PHP

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SquirrelMail is a PHP-based Web email client. It includes built-in pure PHP support for IMAP and SMTP, and renders all pages in pure HTML 4.0 for maximum compatibility across browsers. It has strong MIME support and a flexible plugin system.

mail email-client webmail mail-client webmail-client web-mail

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

Isotope Mail Client - Microservice based webmail client built with ReactJS and Spring

•    Java

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Isotope Mail client is a microservice based webmail client built with ReactJS and Spring. One of the main reasons to develop Isotope Mail is to learn and showcase new technologies, frameworks and libraries and how they can be used in a real life product. There is a stronger focus on achieving top quality code rather than delivering a large number of features.

web-mail webmail e-mail mail mail-client email-client

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.

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

Rainloop Webmail - Simple, modern & fast web-based email client

•    PHP

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Simple, modern & fast web-based email client.Modest system requirements, decent performance, simple installation and upgrade, no database required - all these make RainLoop Webmail a perfect choice for your email solution.

webmail rainloop js imap smtp mail simple modern web-based email client openpgp

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

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

Thunderbird - Email Client

•    C++

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Thunderbird is most popular simple e-mail, newsgroup and news feed client. It is comparable to Microsoft outlook. It supports features such as Firefox's tabbed browsing, Email search, Message archive, Spam filtering, Message grouping, SSL, TLS, POP3 and IMAP support and lot more.

mail email-client mail-client imap pop3 smtp