Geary is described as 'Email application built around conversations, for the GNOME 3 desktop' and is a very popular Email Client in the office & productivity category. There are more than 25 alternatives to Geary for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Geary alternative is Thunderbird, which is both free and Open Source. Other great apps like Geary are Betterbird, Evolution, Microsoft Outlook and eM Client.
BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
Engineered for iOS, macOS, and watchOS, this fast mail client supports multiple account types, custom actions, Smart Inbox filtering, unified inbox, privacy mode, email scheduling, snooze, third-party app integration, flexible personalization, and advanced workflow tools.
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
Mac IMAP email client featuring keyboard control, Markdown email composition, advanced search capabilities, smart mailboxes, automatic signature handling, cryptographic options with OpenPGP/S-MIME, tagging, multiple notifications, and customizable layouts including widescreen.
Mail is designed to let you manage your email quickly and effortlessly. Its interface is based on conversations, so you can read an entire discussion without having to click from message to message.
The Bat! is a secure email client software, built to protect your correspondence against third-parties.
aerc is an email client that runs in your terminal. It's highly efficient and extensible, perfect for the discerning hacker.
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
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BlueMail is my favorite email client on Android. Tons of features, and no ads.