The best open source alternative to Airmail is Thunderbird. If that doesn't suit you, our users have ranked more than 50 alternatives to Airmail and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Airmail are K-9 Mail, Evolution, FairEmail and Mailspring.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
Open-source, privacy-focused email client offering features such as encryption via OpenPGP and S/MIME, unlimited accounts, a unified inbox, customizable settings, and reformatted emails to prevent phishing. Supports two-way synchronization and provides Pro features for additional customization.
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
Geary is an email application built around conversations, for the GNOME 3 desktop.
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
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.
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...
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