Open source почтовый клиент для windows

Do Email Clients Really Matter?

Email is a stand-alone communication mode for any business. However, having multiple accounts and managing them on different platforms consumes precious money.

Got confused?

Time is Money, Right?

Here comes the advantage of open source email client that organizes emails and keep your inbox sorted through a single user interface. These email clients windows save a lot of time for businesses (in other terms, gains you profits). So, it has become the need of the hour to pick the best email software to boost your productivity.Let’s get into some depth about email clients.

Introduction

Although technology is advancing, many people still use emails for professional communications. They made the formal interactions seem simplified and accessible. It will be quite challenging to communicate inside and outside the organizations without the help of emails. It is necessary to use email for effective interaction because it acts as a secure medium for transmitting data. So an open source email client allows enterprises and users to set up a secure and safe interaction.

You know that Open Source Desktop Email Clients play an important role in the effective communication. Specific characteristics they possess make them easy to utilize and reliable.

  • Email clients offer a platform to make companies interact with their users efficiently. They also offer internal communication within a certain organization.
  • They utilize strong encryption keys and complicated algorithms to make secure and safe data transmission.
  • Using them, you can enhance your company’s work efficiency and productivity.

So,elevate your small businesses with one of today’s popular open source desktop email clients mentioned here.

All email clients render almost the same features, but some of them come with additional features. 

Read on to Know More About Best Free Email Clients

1. Thunderbird:

It is available for Windows, Mac, and Linux. Thunderbird is the only free and open source mail clients that is viable for everyday personal use. If you don’t want to go for a premium in your lifetime, it is the best option. Linux users get the maximum benefit out of this email client.

Features

  • No clunky interface, glitchy performance, and lack of advanced features!.

  • You can have add-ons, extensions, and plug-ins within this single interface.

  • Attachments: No need to bother about the huge stack of files as this sends bulk amounts of attachments without any hassles.

  • Integrations include Manoderecha, RadioGNU protocol, Cardbook, and TbSync.

  • Customized Interface: This Open Source Desktop Email Clients customized interface lets you change the way of the view of email as you want.

  • Autorespond:This open source email client feature provides a reply automatically thus saves time.

  • Message Filters: You can have advanced filters that

  • Avatars: This feature lets you download this app at ease.

  • Read and Send Receipts: It lets you confirm on emails whether they were delivered/read or not.

2. Evolution:

It is a personal information management application that offers calendars, address books, task list functionality, and integrated mail. Evolution is an open-source email client that supports different network protocols and industry-standard data formats for exchanging information. It can integrate with Microsoft Exchange smoothly. It also operates well with Gmail too.

Features

  • Calendar view: This email client has a built-in calendar view. It is to have clarity about the overview of your information over time.
    Calendar integration allows you to synchronize your events and tasks with the calendar app.
  • Multiple account support: It supports various accounts without needing to log in and log out.
  • Ad-free: It doesn’t have any type of external advertising.
  • GPG Encryption: Evolution supports GnuPG(GPG) for encrypting messages, files, emails etc.
  • Reminders: It lets you set reminders for events, actions, and tasks depending on time, condition, or place parameters.
    Sync with Google Calendar: You can synchronize the evolution email client with Google Calendar.
  • Spam Filter: It can detect unwanted, virus-infected, unsolicited calls, files, emails etc.

3. Claws Mail:

It is another best open-source email client software for Fedora, Debian, Ubuntu, FreeBSD, and Windows. It is a fast and user-friendly email client through which you can do every task that is email related. It is utilised to maintain your multiple email account emails. You can produce various accounts and configure claws-mail with your email service. For this, you can use the configuration tab. After configuration, use the Get Mail option to acquire all your email accounts in one place.

Features

  • Message: It enables you to pick whether you wish to receive messages from all your accounts or your current account. It will also allow you to compose email messages, forward the email, reply to emails, move emails to trash, and forward attachments etc.
  • Side Tools Panel: You can access your inbox, drafts, sent mail folder, trash etc., from the side tools panel.
  • Filters: You can filter your emails based on parameters like keywords, date, etc.
  • View: It is the best feature that is handy and allows you to alter this software look. It provides features such as thread view, fullscreen, hide all threads, show all headers, and expand all threads etc.
  • Offline Mode: You can disconnect this email client from the internet and use it offline. It also stops the synchronization between the email service provider and the client.

4. Sylpheed:

It is another open source mail client software for Unix, BSD, Linux, and Windows. It is lightweight and simple that you can get with a dated user interface. It doesn’t support any email having graphics. But you can find significant management features like Address Book, Email Tools Panel, Mailbox support etc.

Features

  • Address book: This email client’s address book helps you manage, store, and retrieve your contacts.
  • Email Tools Panel: You can access your sent mail, inbox, junk mail, and trash from this panel.
  • Inbox: You can use the inbox feature to pick from which account you wish to receive emails and messages. It also offers you options for replying to emails, composing mail, and forward emails.
  • View: It helps you optimize the email layout based on your requirements using thread view, collapse threads, expand all threads, separate folder trees etc.
  • Get All option: You can receive all your emails from every account in one place.
  • Delete duplicate messages: It is the best feature through which you can find and eliminate all the duplicated messages.

5. MailSpring:

It is a desktop best email client mainly designed by Windows 10, Linux, and macOS High Sierra. It has modern characteristics like snoozing, templates, offline, search, inbox, and support for the labels of Gmail. It is free and supports every IMAP provider, including iCloud, Gmail, and Office 365. It also has a pro version with many features: contact profiles, read receipts, link tracking, etc.

Features

  • Dark Mode: It supports dark mode for convenient usage in low-light conditions.
  • Unified Inbox: View emails from every account in one unified view with this email client.
  • Support to multiple accounts: It supports various accounts without logging out and logging in.
  • Theme support: You can utilize templates and themes to change the look and feel of this open-source email client.
  • Email Organizer: It enables you to take control of your unified inbox by using controlling and filtering tools.
  • Extensible by Plugins/ Extensions: It can be extended with extensions, plugins, and add-ons.

6. KMail:

It is a state-of-the-art open-source email client windows which integrates well with widely utilized email providers like Gmail. It offers various features and tools for maximizing your productivity. It makes it easy and fast for you to work with large email accounts. KMail greatly supports different email protocols like Microsoft Exchange, POP3, IMAP etc.

Features

  • Secure default settings: It provides specific default settings for great end-to-end encryption support, safeguarding your privacy, and detecting spam.
  • Integration: The meeting invitations can be added easily in the form of events into address auto-completion, KOrganizer, crypto preferences, avatars etc., that are loaded from KAddressBook.
  • Standard Compliant: It supports standard push email, mail protocols, jnline OpenPGP, server site filtering, S/MIME, and PGP/MIME.
  • Other powerful features: It also has many features, which include multiple sender identities, offline support, powerful filtering, searching, multiple language support, mailing list management, tagging functionality, and flexible configuration.

7. Spike:

Spike is a cloud-based email client that is available for Windows 10, macOS, iOS, and Android. It’s rich-feature set include:

Features

  • Built-in Group Chat: No need to ping a single message in this open source email clients windows to multiple people of your team instead you can have a group chat that speeds up the workflow. Even the people who don’t use Spike can join the group.

  • You can connect all your Gmail, Yahoo, iCloud, Hotmail, Office/Outlook 365, GoDaddy email, AOL, IONOS mail, Exchange, and all IMAP mail accounts to Spike’s unified inbox.

  • Calendar, Notes, Task: Create tasks, events, or appointments and add notes to them for more productive email management.

  • Advanced Search: This open source email client lets you find any file in a blink of an eye.

  • Video and Audio Calls: This feature lets you connect with your team/clients via audio/video calls.

  • Real-Time Messaging: read receipts, send later, undo send, snooze are the basic features that streamline the way of emails. You can include multi-media to emails. You can also use translate, text-to-speech, and voice notes for better email management.

  • Priority Inbox: It lets you concentrate on important mails by sending other unimportant messages and newsletters into another inbox.

  • File Preview: You can view the content of a file without opening or downloading it.

  • Reminders: This open source email client feature alerts you on incoming emails and to-do lists.

  • Instant Unsubscribe: It enables you to unsubscribe from unnecessary promotional emails and other subscribed newsletters in a fly.

  • Email Encryption: It lets your confidential data, attachments, and emails even more confidential.

8. Mailtrim:

Mailtrim is the best free email client that works for all desktops-Mac, Windows, and Linux. It is a perfect tool for both small businesses and big giants.This open source email can support IMAP and POP3 servers. The features that vie anybody’s attention are.

Features

  • Great UI: This open source email client is designed with simple and stylish icons and a good layout that fits the monitor of any size. Hence, it can be accessed at ease and quickly.
  • Clutter-free inbox: No restrictions on the number of accounts. It lets you manage multiple email accounts within a single inbox and classify them separately for quick access. You can access all contacts in this single interface as well.
  • Integrations: Cloud storage apps like Google Drive and Dropbox and CRM that enables you to build a strong and long-term relationship with your clients are integrated into this application.
  • Excellent E-mailing: You can label emails with a flag, add a note, and schedule emails. You can create signatures that will be added directly while composing a message. The advanced filters let you find out the required file wherever it is.
  • Preview: You can preview emails, images, and documents without opening them through this Open Source Desktop Email Clients.
  • Advanced Search: This feature lets you retrieve the required mails in a fraction of seconds. No need to go through the entire inbox.
  • Security: PGP support makes emails more secure and confidential.
  • Respond later: This reminds you of important emails that need to be replied in due time.
  • Customization: Display, reminders, and interface can be customizable as per your preferences.
  • EventCalendar: It lets you schedule emails with notes, highlights, and colors and get notified on the same.

9. eM Client:

It is another desktop email client that is available for Windows and Mac OS and compatible with multiple mail servers. This email client open source comes with full support for all email services like Hotmail, Gmail, Yahoo, etc. and also with RSS feed support.

Features

  • Message encryption: This open source email client feature enables more security to your most confidential emails.

  • Calendar and Tasks: You can customize various views and interface, send invitations, and get reminders for all.

  • Contacts organization: Contacts can be synchronized with Gmail, Exchange, iCloud, Office 365, and Outlook. Users can view and manage communication and attachment history for each contact.

  • Advanced search and filters: These features in this Open Source Desktop Email Clients let you retrieve the exact email or attachment that you want.

  • Templates & Signatures: eM Client has a wide variety of email templates to design appealing emails and you can add signatures so that you need not to sign each time you compose a mail.

  • Conversation view: With this feature, all the messages are grouped automatically for easy access.

  • Integration: Chat services like Facebook, Google Talk, and Jabber. Thus, it is considered as an instant messenger.

  • Backup: All the data can be backed up when you need it. YOU no need have the fear of loss of important mail threads.

  • Spell Checker: Just go on writing. The spell checker will let you know when there are grammatical errors.

  • Offline Access: You can manage emails even in offline through this open source email client.

  • Message Encryption: You can sendPGP or S/MIME encrypted emails easily.

  • Premium features include unlimited email accounts, Email translator, VIP support, and Access to the license manager.

10. Mailbird:

This free open source mail client for PC provides you multiple accounts support and other additional features that make email management more hassle-free. This is the reason why it is it is considered as the best open-source email client in the healthcare industry, specially by ehr solutions providers.

Features

  • Contacts Manager: You can merge contacts, create groups, customize interface, themes, and signatures), and use various shortcuts to compose emails and manage them quickly.

  • Customized layout and free themes allow you to customize the view you want.

  • App integration: Mailbird, the open source email client is integrated with storage apps such as Dropbox, Google docs, and Degoo; social apps like Facebook, WhatsApp, Twitter; chat and video conferencing tools like Slack, Asana; task manager tools like Todoist, Trello, moo.do; and Google and kin calendar.

  • Messaging: You can send, unsend, receive, and filter emails. Besides, you can give in-line replies for more clarity.

  • Offline Access: Using this open source email client windows, You can organize emails even in offline in this Open Source Desktop Email Clients.

  • Multi-lingual support: It supports around 21 languages.

  • Snooze: You can postpone a reply by snoozing messages lateras per the priority of the email.

  • Attachment Features: You can attach emails by simply a drag and drop. Also, you can get attachment reminders and the attachment search retrieves you the exact file that you want.

  • Customer Support: Users of Mailbird will have all-around technical support from the

  • Premium Features: If you want to use it commercially, go for the premium. Unlimited email accounts setup, Snooze email feature, email speed reader, attachment quick preview, Linkedin Lookup, and custom sounds are its features that manage emails even smarter.

Wrapping Up:

The open source desktop email clients can push your business ahead of competitors by streamlining your workflow. So, here are the best 5 open source desktop email clients that help you in organizing your emails which saves time. Many Startups and big businesses mainly use these email clients. So, sort out your inbox using a single user interface and arrange your emails without the confusion of finding them by utilizing any of the best open-source email clients.

FAQ’s

Which mail client is open-source?

Mozilla Thunderbird is a more popular open source email client than other email clients. It has many features with various supporting plugins like theming, management of large files, and calendar support.

What email software that is an OSS?

Tutanota is the safe and secure open source alternative to Gmail and Co with a complete focus on privacy, ease of use, and Security.

Does Google have a desktop email client?

Google doesn’t have any desktop email client for Gmail. So the users are stuck utilising internet browser windows as it’s the only route to access the Gmail account.

2024. Группа Астра представила корпоративный почтовый клиент Desktop X

Компания «РуПост» из состава «Группы Астра» вывела на рынок кроссплатформенный почтовый клиент Desktop X. Он ориентирован на бизнес-клиентов и (по словам разработчиков) представляет собой полноценную замену MS Outlook. Новинка работает под Windows и Linux и позволяет пользоваться одним почтовым ящиком с разных компьютеров, т.к. письма хранятся не в памяти устройства, а на почтовом сервере организации. Desktop X в режиме единого окна позволяет пользоваться электронной почтой, календарями и адресными книгами организации. Также его можно интегрировать с CRM-системой компании, штатными мессенджерами, а заодно и с системами видеоконференцсвязи. Напомним, в прошлом году Астра представила бесплатный почтовый клиент RuPost Desktop, основанный на open-source движке Thunderbird. Очевидно, новый X — тоже работает на нем.

2020. Веб-почта Horde перешла на PHP7

Команда open-source проекта Horde представила финальный релиз программного обеспечения для управления почтой в браузере Horde Groupware 5.2.22. И его главное обновление — переход на новую платформу PHP7, а это означает что все пользователи должны будут переводить на PHP7 свои сайты или веб-приложения (если до сих пор этого не сделали). Horde Groupware Webmail — это бесплатная корпоративная почта на основе браузера. Пользователи могут читать, отправлять и систематизировать сообщения электронной почты с помощью четырех различных интерфейсов веб-почты, а также управлять календарями, контактами, задачами и делиться ими. Также, можно создавать заметки, файлы и закладки с помощью компонентов, соответствующих открытым стандартам.

2015. Вышел бесплатный почтовый клиент Claws Mail

Мультиплатформенный почтовый клиент Claws Mail — это бывший Sylpheed-Claws, который отделился от проекта Sylpheed. Это русифицированный почтовик для Windows, Linux, Mac OS X и других UNIX-подобных операционных систем с поддержкой сетевых протоколов POP3, SMTP, IMAP4rev1, NNTP, Usenet news, SSL. Интерфейс программы построен с использованием библиотеки GTK+ (GIMP ToolKit), код распространяется бесплатно под лицензией GPL (GNU General Public License). В новой версии в системе локальных фильтров расширены условия выборки по возрасту сообщений, в окне написания сообщения для строки с адресом отправителя добавлена отдельная метка со своей мнемоникой, в системе быстрого поиска появилась выборка по значению поля «Сс», в контекстное меню списка почтовых папок интегрирована опция рекурсивной пометки прочитанным, добавлена поддержка механизма аутентификации SCRAM-SHA-1 для IMAP.

2015. Roundcube Next — попытка создать браузерный почтовый клиент 2.0

Roundcube — на сегодняшний день самый популярный web-браузерный почтовый клиент в мире. Он интегрирован в миллионы сайтов и приложений. По данным cPanel, Roundcube используют 62 процента пользователей их панели управления. Однако, с технологической точки зрения — это устаревший продукт. Он был создан десять лет назад, как open-source проект в Берне и на тот момент был ультрасовременным, динамичным и красивым. Пользователи были в восторге, и Roundcube быстро стал выбором по умолчанию для многих правительств, университетов, компаний и частных лиц. Но десятилетие — это вечность в технологии. Roundcube не был изначально предназначен для работы на мобильных устройствах и до сих пор их не освоил. Поэтому, компания Kolab Systems, один из спонсоров open-source проекта запустила инициативу по созданию веб-почты 2.0 — Roundcube Next, и уже собрала на эту инициативу $100K на Indiegogo.

2007. Zimbra Desktop — оффлайн клиент для Zimbra

Сегодня компания Zimbra представила альфа-версию оффлайнового клиента Zimbra Desktop. Он позволяет работать с почтой, текстовым редактором и другими веб-сервисами Zimbra через браузер даже в отсутствие подключения к интернету. Клиент Zimbra Desktop будет кросс-платформенным с версиями под Windows, Mac и Linux, а также будет работать в различных браузерах (Firefox, IE, Safari). Веб-приложение и все данные пользователя будут храниться на компьютере клиента в базе данных Apache Derby. При подключении к интернету данные синхронизируются в реальном режиме времени. Оффлайновый клиент работает через такой же Ajax-интерфейс, что и серверная версия. Единственное ограничение клиента — отсутствие поддержки перетаскивания мышкой прямо в браузере, но компания обещает добавить эту функцию в будущих релизах.

2004. Mozilla представила собственный почтовый клиент Thunderbird

Организация Mozilla Foundation выпустила первую версию своего почтового клиента Thunderbird 1.0. Это самостоятельная программа по отношению к недавно вышедшему браузеру FireFox. Бесплатная программа нацелена конкурировать, главным образом, с таким же бесплатным Outlook Express, который главенствует под Windows. Есть версии для Linux и MacOS X. Основные возможности Thunderbird 1.0: адаптируемые фильтры для спама, возможность чтения RSS, папки поиска, как в Outlook 2003, общий ящик для разных учётных записей POP3, группировка писем, защита личных данных, импорт писем из разных почтовых клиентов. Во главу угла Thunderbird разработчики поставили безопасность и функциональность. Как сообщается, если группа, разрабатывающая Mozilla Suite, распылялась на несколько задач, разработчики Thunderbird были четко сфокусированы на задаче создания качественного почтового клиента.

Reviews, comparison, screenshots and more for the 3 top open-source email clients for Windows 10.

Written by

Forward Email Team

Time to read

Less than 5 minutes< 5 minutes

Email Client Screenshots

⭐ RecommendedJavaScript & C++

Mozilla Thunderbird

⭐ RecommendedJavaScript & C++

Mozilla Thunderbird is an open-source email client for Windows 10 and is written in the JavaScript & C++ programming language. The official description from its website says, «Access all your messages, calendars, and contacts in one fast app.«

Mozilla Thunderbird is an open-source email client for Windows 10 and is written in the JavaScript &amp; C++ programming language.

C (GTK)

Claws Mail

C (GTK)

Claws Mail is an open-source email client for Windows 10 and is written in the C (GTK) programming language. The official description from its website says, «Claws Mail is an email client (and news reader), based on GTK+…«

Claws Mail is an open-source email client for Windows 10 and is written in the C (GTK) programming language.

C & GTK+

Sylpheed

C & GTK+

Sylpheed is an open-source email client for Windows 10 and is written in the C & GTK+ programming language. The official description from its website says, «Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client.«

Sylpheed is an open-source email client for Windows 10 and is written in the C &amp; GTK+ programming language.

Email Client Comparison

(Scroll to the right to see entire table)

P.S. Don’t worry – we’re coming out with our own desktop, mobile, and web apps soon!

Notice of Non-Affiliation and Disclaimer: We are not affiliated, associated, authorized, endorsed by, or in any way officially connected with Mozilla Thunderbird, Claws Mail, and Sylpheed, or any of its subsidiaries or its affiliates. The name Mozilla Thunderbird, Claws Mail, and Sylpheed as well as related names, marks, emblems, and images are registered trademarks of their respective owners.

Email remains an essential communication tool for both personal and professional use.

While many users opt for web-based services, desktop email clients continue to offer advantages in terms of privacy, customization, and offline access.

Open source email clients, in particular, provide transparency, community support, and freedom from vendor lock-in.

These applications are developed by passionate communities committed to privacy, security, and user-centered design.

This guide explores some of the best free open source email clients available today, highlighting their unique features and helping you find the perfect solution for your email management needs.

Let’s dive in.

1. Mozilla Thunderbird

Mozilla Thunderbird stands as one of the most established and comprehensive open source email clients available.

Developed by the same organization behind Firefox, Thunderbird offers a robust feature set that includes support for multiple email accounts, customizable tags and filters, and an integrated calendar.

The client excels at managing high volumes of emails through its advanced search capabilities and quick filtering tools.

Its open source nature has fostered a thriving extension ecosystem, allowing users to enhance functionality with add-ons for encryption, contact management, and productivity tools.

Thunderbird’s cross-platform compatibility (Windows, macOS, and Linux) ensures users can maintain a consistent experience across different operating systems, while its commitment to security includes built-in phishing protection and regular security updates.

The client’s interface, while initially appearing somewhat dated, offers extensive customization options that allow users to create a personalized email environment tailored to their specific workflows.

Also Read: Best Anonymous Email Account Providers

2. BlueMail

BlueMail offers a polished, feature-rich email experience that bridges the gap between open source principles and commercial-grade user experience.

After transitioning to open source in 2019, this cross-platform client has maintained its sophisticated interface while opening its development to community contributions.

BlueMail excels at handling multiple email accounts with intelligent grouping features that automatically categorize messages based on content and sender.

The client’s “People Toggle” view organizes emails by sender rather than chronology, creating a more conversation-centric experience similar to messaging applications.

BlueMail includes advanced scheduling features, allowing users to snooze emails until relevant times or schedule outgoing messages for optimal delivery.

The application’s calendar integration provides seamless coordination between email communications and scheduling, with natural language processing that can automatically detect and suggest adding events mentioned in messages.

BlueMail’s mobile applications offer particular attention to usability with gesture controls and notification customization that make on-the-go email management more efficient.

While maintaining its premium tier for additional features, BlueMail’s core functionality remains free and open source, providing a compelling option for users seeking polished design alongside transparency.

Explore: Best Free Email Account Providers

3. K-9 Mail

K-9 Mail has established itself as the premier open source email client for Android devices, offering a level of control and privacy rarely found in mobile email applications.

This lightweight yet powerful client supports multiple accounts, IMAP push email, and offers extensive customization options for notifications, display settings, and account-specific signatures.

K-9 Mail’s focus on security is evident in its support for OpenPGP encryption through integration with OpenKeychain, allowing users to exchange encrypted messages directly from their mobile devices.

The client’s efficient offline operation enables users to compose, read, and organize emails without an internet connection, with changes synchronizing once connectivity is restored.

While K-9’s interface initially presents a learning curve compared to some mainstream email apps, its logical organization and customization options ultimately create a highly efficient email workflow.

The application’s active development community continually enhances features and addresses security concerns, making it a trustworthy solution for privacy-conscious mobile users.

4. Nylas Mail

Nylas Mail combines sophisticated design with powerful functionality in an open source package that appeals to both casual users and professionals.

Built on modern web technologies, this cross-platform client offers a clean, intuitive interface while supporting advanced features like conversation tracking, send later, and rich contact profiles.

Nylas excels at handling multiple accounts from various providers, presenting them in a unified inbox with customizable views and sorting options.

The client’s plugin architecture encourages community contributions, resulting in extensions for encryption, productivity tools, and service integrations.

Nylas Mail’s search functionality provides contextual results that include both message content and attachment information, making it easy to locate specific items in large email archives.

The application includes robust keyboard shortcuts for efficient navigation and operation, appealing to power users who prefer minimal mouse interaction.

While development of the original Nylas Mail has been discontinued, the open source community has forked the project to continue improving and maintaining this powerful email solution, demonstrating the resilience and sustainability inherent in open source software development.

Explore: Best Tuta Alternatives

5. Mailspring

Mailspring represents a more modern approach to open source email clients, offering a sleek, contemporary interface while maintaining the transparency and community benefits of open source development.

Built on Electron, Mailspring provides a consistent experience across Windows, macOS, and Linux platforms.

The client features an impressive array of productivity tools, including send later functionality, read receipts, link tracking, and quick reply templates.

Mailspring’s unified inbox presents a streamlined view of multiple accounts, while its conversation view organizes emails into logical threads for easier following of discussions.

The application includes powerful search capabilities that index the full text of messages for lightning-fast results.

Mailspring’s composer includes rich formatting options, easy file attachments, and inline image support.

While the core application is fully open source, Mailspring offers a premium tier with additional features such as advanced tracking and enhanced productivity tools, providing a sustainable development model while keeping essential functionality free and open.

The client’s focus on user experience and modern design makes it particularly appealing to users transitioning from proprietary email solutions.

6. Claws Mail

Claws Mail emphasizes speed and efficiency in a lightweight package that performs exceptionally well even on older hardware.

This GTK+-based client offers remarkable stability and quick operation across Linux, Windows, and BSD systems.

Claws Mail’s modular architecture allows users to extend functionality through plugins for calendar integration, RSS feeds, PDF viewing, and spam filtering without compromising the core application’s performance.

The client’s configuration options provide granular control over everything from interface appearance to networking parameters, appealing particularly to technical users who appreciate fine-tuned control.

Claws Mail features robust support for POP3, IMAP, and SMTP protocols along with SSL/TLS encryption for secure communications.

While its interface might appear utilitarian compared to more visually polished alternatives, this design philosophy contributes to the client’s exceptional performance and reliability.

The application’s powerful filtering system and search capabilities make managing large email archives straightforward, allowing users to quickly locate specific messages based on various criteria.

Explore: Tuta vs Protonmail

7. Evolution

Evolution delivers a complete personal information management solution that extends beyond email to include calendar functions, contact organization, and task management.

Originally developed for GNOME desktop environments, this client has become a staple for many Linux users while also offering Windows compatibility.

Evolution’s integration with corporate email systems, particularly Microsoft Exchange servers through its Evolution Exchange connector, makes it an excellent choice for organizations transitioning to open source solutions.

The client features robust encryption options, including OpenPGP and S/MIME support, ensuring secure communication channels for sensitive information.

Evolution’s unified inbox allows users to manage multiple accounts seamlessly, while its powerful filtering capabilities help organize incoming messages according to user-defined rules.

The application’s clean, intuitive interface strikes a balance between functionality and accessibility, making it suitable for both casual users and power users requiring advanced features.

Evolution’s search functionality deserves special mention, offering lightning-fast results even when navigating large email archives.

8. Sylpheed

Sylpheed delivers a streamlined email experience focused on simplicity, security, and efficiency.

This lightweight client runs smoothly on minimal hardware, making it ideal for older computers or systems with limited resources.

Despite its small footprint, Sylpheed supports essential features including multiple accounts, filtering, and search capabilities.

The client emphasizes security with built-in support for GnuPG encryption and SSL/TLS connections.

Sylpheed’s interface follows a traditional three-pane layout with folders, message list, and content views arranged for intuitive navigation.

The application supports junk mail filtering to help manage unwanted messages, along with customizable templates for frequently used responses.

Sylpheed’s development philosophy prioritizes stability and reliability over feature bloat, resulting in an application that performs consistently across Linux, Windows, and other platforms.

While lacking some of the visual polish and advanced features of larger clients, Sylpheed’s focused approach to email management appeals to users seeking a straightforward, dependable solution for their communication needs.

Explore: Protonmail Review

9. Geary

Geary brings a refreshingly minimalist approach to email management with a clean, conversation-focused interface designed specifically for GNOME desktop environments.

This lightweight client emphasizes usability and simplicity while still offering essential features for effective email handling.

Geary’s conversation view presents emails as threaded discussions, making it easier to follow complex exchanges without losing context.

The client supports multiple accounts with a unified inbox option, quick search capabilities, and seamless integration with desktop notifications.

Geary’s composers provides a distraction-free writing environment with support for basic formatting and attachments, staying true to its philosophy of focused simplicity.

The application’s startup time and message loading speeds are notably fast, making it ideal for users who frequently check their email throughout the day.

While Geary intentionally avoids overwhelming users with configuration options, its thoughtful defaults and intuitive design make it immediately productive for most email tasks.

The client’s development team continues to refine the balance between essential functionality and interface simplicity, making Geary particularly appealing to users who value streamlined, distraction-free tools.

10. Trojitá

Trojitá stands out for its exceptional handling of IMAP email accounts, using innovative technical approaches to deliver remarkable speed and efficiency.

Developed primarily for the Qt platform, this open source client employs on-demand message loading and network request batching to minimize bandwidth usage and maximize performance, making it particularly valuable for users with limited connectivity or large mailboxes.

Trojitá’s interface follows a logical multi-column layout that adapts well to different screen sizes, from desktop monitors to smaller tablet displays.

The client excels at offline operations, intelligently synchronizing when connectivity becomes available without requiring user intervention.

Trojitá includes powerful search capabilities that leverage IMAP server-side searching when available, resulting in extremely fast results even across large message archives.

While primarily focused on IMAP protocol support, the client handles this specific use case with exceptional attention to technical details and performance optimization.

Trojitá’s clean codebase and focused development approach have made it a foundation for other email projects seeking reliable IMAP handling, demonstrating how specialized open source tools can excel by perfecting specific functionality rather than attempting to cover all possible use cases.

11. Rainloop

Rainloop distinguishes itself as a browser-based open source email client that users can install on their own servers, combining webmail convenience with self-hosting privacy benefits.

This PHP-based solution features a clean, responsive interface accessible from any modern browser across desktop and mobile devices.

Rainloop supports multiple email accounts with unified inbox functionality, featuring drag-and-drop operations for message management and file attachments.

The client includes conversation threading, contact management, and calendar integration, covering all essential personal information management needs in a web-based environment.

Rainloop’s security features include two-factor authentication and encryption options, while its plugin architecture allows for customization and extension beyond core functionality.

The application’s responsive design adapts seamlessly to different screen sizes, providing consistent usability across devices without requiring separate applications.

Rainloop’s self-hosting model gives organizations and individuals complete control over their email interface without relying on third-party services, making it particularly valuable for privacy-conscious users who still want the accessibility of web-based email.

The client’s active community continues to enhance security features and usability, making Rainloop a mature option for those seeking a self-hosted email solution.

Also Read: The Ultimate Gmail Review

12. Balsa

Balsa offers a mature, dependable email client built for the GNOME desktop environment with a focus on accessibility and standards compliance.

This lightweight application provides a familiar three-pane interface with folders, message lists, and content views arranged for efficient navigation.

Balsa includes multi-account support with customizable sending and receiving options for each account, along with flexible filtering capabilities for organizing incoming messages.

The client features built-in support for GPG encryption, enabling secure communication directly within the application without requiring external plugins.

Balsa’s MIME handling includes proper display of various content types and attachments, while its composer supports both plain text and formatted messages.

The application’s strong accessibility features, including keyboard navigation and screen reader compatibility, make it particularly valuable for users with specific accessibility requirements.

Balsa’s development history spans decades, resulting in a stable, reliable application with well-tested code and consistent behavior.

While primarily designed for Linux environments, Balsa exemplifies the open source ethos of creating software that works reliably without unnecessary complexity or resource demands, appealing to users who prioritize stability and predictable behavior in their email tools.

Conclusion

Open source email clients represent more than just alternatives to proprietary software.

They embody a philosophy of user control, transparency, and community collaboration.

Each of the clients discussed offers unique strengths, whether in security features, interface design, cross-platform compatibility, or resource efficiency. The beauty of open source solutions lies in their adaptability.

Users can choose clients that align with their specific requirements and values, or even contribute to their development.

Enjoyed the post?

Tom loves to write on technology, e-commerce & internet marketing.
Tom has been a full-time internet marketer for two decades now, earning millions of dollars while living life on his own terms. Along the way, he’s also coached thousands of other people to success.

Nylas Mail — the open-source, extensible mail client

N1 Screenshot

Nylas Mail was an open-source mail client built on the modern web with Electron, React, and Flux. It was designed to be easy to extend, and many third-party plugins are available that add functionality to the client.

⚠️ Nylas Mail was initially released and open-sourced in early 2015 and was maintained by Nylas until Spring 2017. While Nylas no longer supports Nylas Mail, you can download the latest release or build it from source. There are also several forks that are being actively developed and maintained.

Getting Started

Setup your Environment (Mac):

  1. Install Homebrew
  2. Install NVM & Redis brew install nvm redis
  3. Install Node 6 via NVM: nvm install 6
  4. npm install

Setup your Environment (Linux — Debian/Ubuntu):

  1. Install Node 6+ via NodeSource (trusted):
  2. curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
  3. sudo apt-get install -y nodejs
  4. Install Redis locally sudo apt-get install -y redis-server redis-tools
    benefit of letting us use subdomains.
  5. npm install

Running Nylas Mail

  1. npm run client: Starts the app
  2. npm run test-client: Run the tests
  3. npm run lint-client: Lint the source (ESLint + Coffeelint + LESSLint)

Exploring the Source

This repository contains the full source code to the Nylas Mail client and it’s backend services. It is divided into the following packages:

  1. Isomorphic Core: Shared code across local client and cloud servers
  2. Client App: The main Electron app for Nylas Mail
    mirrored to open source repo.
  3. Client Sync: The local mailsync engine integreated in Nylas Mail
  4. Client Private Plugins: Private Nylas Mail plugins (like SFDC)
  5. Cloud API: The cloud-based auth and metadata APIs for N1
  6. Cloud Core: Shared code used in all remote cloud services
  7. Cloud Workers: Cloud workers for services like send later

See /packages for the separate pieces. Each folder in /packages is
designed to be its own stand-alone repository. They are all bundled here
for the ease of source control management.

Digging Deeper

In early 2016, the Nylas Mail team wrote extensive documentation for the app that was intended for plugin developers. This documentation lives on GitHub Pages and offers a great overview of the app’s architecture and important classes. Here are some good places to get started:

  • Application Architecture
  • Debugging Nylas Mail

The team has also given conference talks and published blog posts about the client:

  • ReactEurope: How React & Flux Turn Apps Into Extensible Platforms

  • ForwardJS: Electron, React & Pixel Perfect Experiences

  • Blog: Splitting from Atom

  • Blog: Building Plugins for React Apps

  • Blog: Nylas Mail Build Process

  • Blog: Low level Electron Debugging

  • Blog: A New Search Parser

  • Blog: Developers Guide to Emoji

  • Blog: Nylas Pro

  • Blog: Nylas Mail & PGP

  • Blog: Calendar Events and RRULEs

Running the Cloud

When you download and build Nylas Mail from source it runs without its cloud components. The concept of a «Nylas ID» / subscription has been removed, and plugins that require server-side processing are disabled by default. (Plugins like Snooze, Send Later, etc.)

In order to use these plugins and get the full Nylas Mail experience, you need to deploy the backend infrastructure located in the cloud-* packages. Deploying these services is challenging because they are implemented as microservices and designed to be run at enterprise scale with Redis, Postgres, etc. Because these backend services must access your email account, it is also important to use security best-practices (at the very least, SSL, encryption at rest, and a partitioned VPC). For more information about building and deploying this part of the stack, check out the cloud-core README.

Themes

The Nylas Mail user interface is styled using CSS, which means it’s easy to modify and extend. Nylas Mail comes stock with a few beautiful themes, and there are many more which have been built by community developers

N1 Themes

Bundled Themes

  • Dark
  • Darkside (designed by Jamie Wilson)
  • Taiga (designed by Noah Buscher)
  • Ubuntu (designed by Ahmed Elhanafy)
  • Less Is More (designed by Alexander Adkins)

Community Themes

ToogaBooga Material Monokai
Agapanthus—Inbox-inspired theme Stripe Kleinstein—Hides account sidebar
Arc Dark Solarized Dark Darkish
Predawn Ido—Polymail-inspired theme Berend
ElementaryOS LevelUp Sunrise
BoraBora Honeyduke Snow
Hull Express DarkSoda
Bemind Dracula MouseEatsCat
Sublime Dark Firefox Gmail

To install community themes:

  1. Download and unzip the repo
  2. In Nylas Mail, select Developer > Install a Package Manually...
  3. Navigate to where you downloaded the theme and select the root folder. The theme is copied into the ~/.nylas-mail folder for your convinence
  4. Select Change Theme... from the top level menu, and you’ll see the newly installed theme. That’s it!

Want to dive in more? Try creating your own theme!

Plugins

Some plugins come pre-installed, and are a great starting points for creating your own:

  • Translate—Works with 10 languages
  • Quick Replies—Send emails faster with templates
  • Emoji Keyboard—Insert emoji by typing a colon (:) followed by the name of an emoji symbol
  • GitHub Sidebar Info
  • View on GitHub
  • Personal Level Indicators
  • Phishing Detection

Community Plugins

Note these are not tested or officially supported by Nylas, but we still think they are really cool! If you find bugs with them, please open GitHub issues on their individual project pages, not the Nylas Mail (N1) repo page. Thanks!

Jiffy—Insert animated GIFs Weather Todoist
Unsubscribe Squirt Speed Reader Website Launcher—Opens a URL in separate window
Cypher—PGP Encryption Avatars Events Calendar (WIP)
Mail in Chat (WIP) Evernote Wunderlist
Participants Display GitHub

When you install packages, they’re moved to ~/.nylas-mail/packages, and Nylas Mail runs apm install on the command line to fetch dependencies listed in the package’s package.json

Forks

There are several forks of Nylas Mail that you should check out. If you’re just learning about Nylas Mail, it is highly recommended you use one of these instead.

  • Mailspring — Significant rewrite by one of the original authors focused on performance and cloud plugins
  • Nylas Mail Lives — Community effort to fix bugs and improve the client! (Seeking Maintainers)

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