The best Contact Manager alternative to Apple Mail is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Apple Mail and seven of them are Contact Managers so hopefully you can find a suitable replacement. Other interesting Contact Manager alternatives to Apple Mail are Tuta Mail, Evolution, EssentialPIM and Kontact.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.
Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook system, and more.
Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run Koma-Mail from your flash drive but, of course, also on your desktop.
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It has too crowded a look to listing email. Compare the wide screen view of both. Thunderbird puts all the details on one line, apple uses multiple lines and gives whitespace between mails.