Apple Mail is described as 'Access, view and manage messages from all your email accounts in one place. Categorize your messages into easy to browse categories. Catch up on email easily with Apple Intelligence powered Priority Messages and summarizations' and is a very popular Email Client in the office & productivity category. There are more than 100 alternatives to Apple Mail for a variety of platforms, including Web-based, Windows, Mac, Android and iPhone apps. The best Apple Mail alternative is Thunderbird, which is both free and Open Source. Other great apps like Apple Mail are Proton Mail, Gmail, Tuta Mail and K-9 Mail.
Shortwave is an email app that takes the pain out of managing your inbox, making it effortless to stay organized, productive, and responsive.
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
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...
Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
Purelymail is an email hosting app that allows users to manage their emails using their preferred email client software or through the app's webmail service, which is powered by Roundcube. The app is compatible with most mail apps, supporting IMAP and POP3 protocols.
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
Commercial email service emphasizing OpenPGP message encryption, SSL/TLS security, two-step authentication, file storage, custom domains, iOS support, spam filtering, ad-free web interface, and secure communications accessible via browsers and existing clients.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
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.
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.
FREE e-mail account with IMAP, spam and virus protection with UNLIMITED storage (GMail max. 15 GB). Because of this AOL WebMail is ideal as E-mail archive or E-Mail-Backup utility for other Mail accounts.
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As a text based client, it is a different class of mail clients, not what someone looking for an alternative to Apple Mail would consider.