The best Contact Manager alternative to Airmail is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Airmail and five of them are Contact Managers so hopefully you can find a suitable replacement. Other interesting Contact Manager alternatives to Airmail are Evolution, Kontact, sup and Koma-Mail.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
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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