emclient.com
eM Client is an email client, webmail service, or mail productivity tool for managing inboxes.
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f-droid.org
Monocles mail is a secure and open source e-mail client for Android, described as a fork of K-9 mail that keeps the known functions of K-9 mail with some UI updates. It supports multiple accounts, a unified inbox, local and server-side search, and OpenPGP email encryption. The source states it is privacy-friendly, with no tracking and only connecting to the user's email provider.
claws-mail.org
Claws Mail is an email client and news reader based on GTK+. It offers multiple accounts, threaded display, filtering and MIME attachments, plus Usenet news reading and posting, with SSL over POP3, SMTP, IMAP4rev1 and NNTP. Messages are managed in the standard MH format, and additional functionality is provided by plugins. It is distributed under the GPL.
thunderbird.net
Open source email client for managing mail, calendars, contacts, and add-ons across accounts.
getmailspring.com
Mailspring is a native email client for Mac, Windows, and Linux supporting multiple accounts including IMAP and Office 365. Its Pro tier adds read receipts, link tracking, send later, follow-up reminders, and templates. The client is free to download, with Pro at $8/month.
caniemail.com
Can I Email? provides support tables for HTML and CSS features in email clients. The site lists features and tracks support across clients such as Apple Mail, Gmail, Outlook, Yahoo! Mail and others, and includes a client scoreboard.
canarymail.io
Canary Mail is an email client with AI features and a built-in calendar for Mac, iPhone, iPad, Windows and Android. It offers a unified inbox for multiple accounts, AI Copilot drafting and summaries, and privacy-focused features such as on-device triage.
github.com
Desktop email client with unified inbox, search, themes, and productivity features.
roundcube.net
Roundcube is free and open source webmail software written in PHP. It is a browser-based multilingual IMAP client with a desktop-like interface offering drag-and-drop message management, MIME and HTML support, address book with groups and LDAP connectors, threaded message listing, spell checking, shared IMAP folders and a plugin API. It supports PGP encryption and is released under the GNU General Public License version 3 or later.
useplaintext.email
Use plain text email is a guide explaining plain text and HTML email, recommending email clients that compose plain text by default and giving setup instructions for other clients. It also covers etiquette recommendations and reasons to prefer plain text, and is brought to you by sourcehut.
microsoft.com
Microsoft email and calendar service for personal, business, and web-based mail management.
edbrowse.org
Edbrowse is a text-based combination editor, browser, and mail client with an interface similar to /bin/ed. It was originally written for blind users but is also used by sighted users for its scripting capabilities. A batch or cron job can access web pages, submit forms, and send email without human intervention. Edbrowse can also access databases through ODBC.
outlook.live.com
Microsoft email and calendar service for personal, business, and web-based mail management.