Open Source Email Software
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Email Software
View 270 business solutionsBrowse free open source Email software and projects below. Use the toggles on the left to filter open source Email software by OS, license, language, programming language, and project status.
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Give your HR team the tools they need to streamline administrative tasks, support employees, and make informed decisions with the OrangeHRM free and open source HR software.
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ProcureDesk is an integrated purchasing and invoicing platform tailored to help small to medium sized businesses streamline their procurement processes. This user-friendly system automates workflows and consolidates purchasing data into a centralized dashboard, allowing companies to control spending and enhance transparency efficiently. Features like automated invoice matching, simple requisition creation, and immediate cash flow insights minimize manual tasks and boost operational efficiency. ProcureDesk is perfect for smaller enterprises leveraging big-business strategies to reduce costs and optimize their purchasing activities. Discover how ProcureDesk can transform your procurement process into a more effective and manageable part of your business.
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IGSuite - Integrated Groupware Suite
IGSuite is a web-ajax-based Integrated Groupware Suite
IGSuite is a web-based Integrated Groupware Suite oriented to be a CRM solution. In the Suite you can find: IGWebMail, IGCalendar, IGContacts, IGArchive, IGWiki, IGTodo, IGChat, Projects, IGFax an HylaFax client, IGFileManager, IGMsg and many other. -
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threadkey
Add keyboard shortcuts to switch between different thread views
Strike the 'T' key to sort messages by thread, strike the 'U' key to sort unthreaded again, just like the 'G' key switches to Grouped By Sort view. -
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Google Apps Manager
Command line management for Google G Suite
Google Apps Manager or GAM is a free and open source command line tool for Google G Suite Administrators that allows them to manage many aspects of their Google Apps Account quickly and easily. With GAM you can create and manage users, groups and domains; manage email, security and calendar settings; manage admins and organizations and many more. To use GAM Google Apps Business, Education, Partner or Government Edition is required. -
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Tutanota
Open source email service with a strong focus on security and privacy
Tutanota is an open source email client focused on security and privacy. It is built with end-to-end encryption and 2FA, so you can be assured of utmost email security. Tutanota is always encrypted, so whether you’re using their secure webmail client, mobile apps or desktop clients, you can be sure to communicate securely. -
Take away the pain and hassle associated with applicant recruitment, hiring, and onboarding with ApplicantStack. Designed for HR professionals and recruiters, ApplicantStack helps streamline the recruiting and onboarding processes to improve productivity and reduce costs. ApplicantStack provides a complete toolkit that includes tools for posting, launching, and advertising jobs, assessing and managing candidates, collaborating with teams, centralizing information for quick hiring and onboarding, and more.
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E-MailRelay
SMTP email proxy and relay server
E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. As a proxy all messages can be passed through a user-defined program, such as a spam-filter, which can drop, readdress, or edit messages as they pass through. -
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Anti-Spam SMTP Proxy Server
Anti-Spam SMTP Proxy Server implements multiple spam filters
The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24226. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained. -
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Cypht
Lightweight Open Source webmail written in PHP and JavaScript
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. The driving force behind Cypht development is to provide combined views for multiple accounts, but it's also a standard E-mail client that lets you browse and manage IMAP folders and send outbound messages with SMTP. Cypht is an application built entirely of plugins, or as we call them, module sets (which is obviously way cooler sounding than plugins), that are executed by the framework. Modules provide a flexible way to add new features or customize the program without hacking the code. Cypht is Open Source (LGPL V2), and written in PHP and JavaScript. -
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Arcjet
Arcjet JS SDKs. Rate limiting, bot protection, email verification
Arcjet helps developers protect their apps in just a few lines of code. Implement rate limiting, bot protection, email verification, and defense against common attacks. Native security for Bun, Next.js, Node.js, SvelteKit, Vercel, Netlify, Fly.io, and other modern platforms. Customizable protection for signup forms, login pages, API routes, and your whole app. Test security rules locally. Protection that works in every environment. No agent is required. -
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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.
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The Vivantio Platform allows you to focus on the IT service management tools that make sense for your organization’s unique service model: from incident, problem and change requests, to service requests, client knowledge and asset management
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Best Email Backup Software
Free Email Backup Software | Email Backup App for Android
The all-in-one email backup tool that enables you to easily restore emails, create backups, convert, and view email archive files. -- Backup emails from virtually any email service provider that supports the IMAP/POP3 protocol, including popular providers such as Gmail, Yahoo Mail, Zoho Mail, Office 365, etc. -- Restore your email account from EML, PST, MSG, MBOX, and ZIP file formats. -- Export emails to EML format. -- Email to PDF: Save emails as PDFs, and download all attachments and raw files. -- Email Archive Converter: Convert PST and MBOX archive files to EML format. -- Email Archive Viewer: View email archive files and use advanced search options. -- Preserve all email properties such as To, Cc, Bcc, From, Subject, headers, attachments, links, and formatting. -- Maintain an accurate folder structure during backup or restore. -- Export emails with a custom date range and selected folders. -- Simple GUI, easy to use, and supports all major platforms: Windows, Mac, Linux -
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Mailspring
A faster, leaner email client and fork of Nylas Mail
Mailspring is a fast and lean mail client that’s a new version of Nylas Mail. It’s maintained by one of Nylas Mail’s original authors, with plenty of great features and enhancements such as a new C++ sync engine that allows it to use 50% less RAM. Heavy dependencies have also been removed and the package manager rewritten for even greater speed. Written in TypeScript with Electron and React, it is cross-platform (macOS, Windows and Linux) and designed to be easy to extend. -
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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.
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Swoosh
Compose, deliver and test your emails easily in Elixir
We have applied the lessons learned from projects like Plug, Ecto and Phoenix in designing clean and composable APIs, with clear separation of concerns between modules. Swoosh comes with many adapters, including SendGrid, Mandrill, Mailgun, Postmark and SMTP. Compose, deliver, and test your emails easily in Elixir. Swoosh supports the most popular transactional email providers out of the box and also has an SMTP adapter. Adding new adapters is super easy and we are definitely looking for contributions on that front. Get in touch if you want to help! Check the documentation of the adapter you want to use for more specific configurations and instructions. Swoosh does not make any special arrangements for sending emails in a non-blocking manner. Opposite to some stacks, sending emails, talking to third party apps, etc in Elixir do not block or interfere with other requests, so you should resort to async emails only when necessary. -
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Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
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NOCC is a simple and fast Webmail client which can handle POP3 and IMAP mailboxes and sends email via SMTP. It is written with PHP, has low requirements (no database, frames). Features multi-language support, MIME attachments, displays HTML messages. The installation guide comes with the source code: https://sourceforge.net/p/nocc/code/HEAD/tree/trunk/webmail/docs/INSTALL If you encounter problems or bugs you can always try the current HEAD version: https://sourceforge.net/p/nocc/code/HEAD/tarball?path= Questions, bug reports or support requests are very welcome: https://sourceforge.net/p/nocc/_list/tickets Alternative source code repository: https://github.com/oheil/NOCC
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JMultiSend
A simple and fast cross-platform solution to send mass emails.
JMultiSend is a simple and fast solution to send mass emails (Bulk E-mail); it only needs to load the list of addresses, the message (HTML or TXT), the data and then send. It is possible also to manage mailing lists subscribtions simply by emails, to send personalized messages with username and to schedule delays up to 24h (86400 secs); all this also from command-line. Since it is developed in Java it is a cross-platform application and does not need installation but needs only the Java Virtual Machine (version 6 or higher) that, in the case, is very easy to download and install. -
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VarDumper Component
Provides mechanisms for walking through any arbitrary PHP variable
The VarDumper component provides mechanisms for walking through any arbitrary PHP variable. It provides a better dump() function that you can use instead of var_dump(). The VarDumper component creates a global dump() function that you can use instead of e.g. var_dump. By using it, you’ll gain per object and resource types specialized view to e.g. filter out Doctrine internals while dumping a single proxy entity, or get more insight on opened files with stream_get_meta_data. Configurable output formats, HTML or colored command line output. Ability to dump internal references, either soft ones (objects or resources) or hard ones (=& on arrays or objects properties). Repeated occurrences of the same object/array/resource won’t appear again and again anymore. Moreover, you’ll be able to inspect the reference structure of your data. Ability to operate in the context of an output buffering handler. -
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ElectronMail
Unofficial ProtonMail Desktop App
ElectronMail is an Electron-based unofficial desktop client for ProtonMail. The app aims to provide enhanced desktop user experience enabling features that are not supported by the official in-browser web clients. It is written in TypeScript and uses Angular. The way of verifying that the installation packages attached to the releases have been assembled from the source code is being provided. The app works on Linux/OSX/Windows platforms. Binary installation packages. Offline access to the email messages (attachments content not stored locally, but emails body content). The local store feature enables storing your messages in the encrypted database.bin file (see FAQ for file purpose details). So the app allows you to view your messages offline, running full-text search against them, exporting them to EML/JSON files. etc. Enabled since v2.0.0 release. -
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Mail Notifier
Mail Notifer for Windows
Mail Notifier is free, modern email notifier with the latest user interface trends for Windows 10/11. It supports multiple accounts and IMAP/POP3 protocols. Enjoy customizable notifications, message previews, and more, all in 18 languages! For more details, please refer to the readme.txt file (Files tab, description below). Note: Gmail support is currently unavailable due to verification requirements by Google. -
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SaltOS
SaltOS, ERP, CRM, Business Management Suite, Josep Sanz Campderrós
SaltOS is a Business Management solution 100% Cloud Computing. It integrates features like CRM (Customer Relation Management) and ERP (Enterprise Resource Planning). Moreover is it licensed as 100% free software GPL-3.0. -
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Modoboa
Mail hosting made simple
Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. It provides useful components such as an administration panel and webmail. Modoboa integrates with well known software such as Postfix or Dovecot. A SQL database (MySQL, PostgreSQL or SQLite) is used as a central point of communication between all components. Modoboa is developed with modularity in mind, expanding it is really easy. Actually, all current features are extensions. It is written in Python 3 and uses the Django, jQuery and Bootstrap frameworks. Follow the evolution of your server traffic thanks to a few builtin graphics: messages distribution per type and average size. Easily use standard protocols like DKIM or DMARC to improve your sender reputation and so make sure your emails will be delivered. Consult your emails everywhere thanks to simple but functional builtin webmail. -
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Isync
mailbox synchronizer
A command line utility for synchronizing remote IMAP mailboxes and local maildir-style mailboxes. This is useful for working in disconnected (off-line) mode, such as on a laptop, but also for mirroring mailboxes between servers. -
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Fetchmail - the mail-retrieval daemon
Client daemon to move mail from POP and IMAP to your local computer
Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop. -
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X-Itools: Email/Web Log Search Engine
Strong Email & Apache Log Analysis with Active Security Features
X-Itools: eXtended Internet Tools. Suite of tools composed of several collaboration modules. Old and initial project born in 1999, 1st published in 2001 on Sourceforge. X-Itools E-mail management module (log analysis) initiated in 2004 with Web 1.0 technologies (private SVN server). X-Itools development restarted since 2011, on the basis of a unique module: E-mail management module (log analysis). Now based on web 2.0 technologies (ExtJS 4.1) and devel restarted because of a particular interest given to it by a world wide Organization (United Nations). Module renamed "X-Itools ELSE", for "X-Itools E-mail Log Search Engine". Some features: Log analysis and correlation of Postfix and Exchange servers, statistics, policy manager, in-deep analysis, automated network graphs for e-mail tracing, CSV export... The Swiss knife of Messaging Admins. In 2015, X-Itools ELSE is no more limited to E-mail logs: Apache logs are also processed and related stats and dashboards will be there! -
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Roundup Issue Tracker
Simple-to-use/-install issue-tracking system: web, REST, email, CLI
Roundup is a simple-to-use and -install issue-tracking system with command-line, web, REST, XML-RPC, and e-mail interfaces. It runs on python 2.7 or 3.6 or newer. Roundup has been deployed for: * bug tracking and TODO list management (the classic installation) * customer help desk support (with a wizard for the phone answerers, linking to networking, system and development issue trackers) * issue management for IETF working groups * sales lead tracking ...and so on. It's been designed with flexibility in mind - it's not just another bug tracker. Roundup ships with a *demo tracker* to play with - after you've unpacked the source, just run "python demo.py" and load up the URL it prints out! Get current development source from mercurial repo at: <https://sourceforge.net/p/roundup/code/ci/default/tarball?path=>