Apps similar to mu include Thunderbird, which is free and open source. Other options are Betterbird, Columba, iRedMail and notmuch. In total there are nine Email Clients like mu for Linux, Mac, Windows, self-hosting and Android.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
United States
Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.
Germany
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Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
A fully fledged, free email server solution, an open source project (GPL v2).
Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.
Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
Works on both no.
Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages. It uses the Xapian library to provide fast, full-text search of very large collection of email with a very convenient search syntax.
nmzmail is a tool, primarily to be used with mutt, for indexing and searching maildir folders. Based on the result of a search query using the search
Astroid is a Mail User Agent. As such, all Astroid provides is a graphical interface to your email. Thus, Astroid enables you to launch actions that rely on the performance of other programs to actually fetch, sync, index, search and send your email.
Navigate messages with zooms and swipes across your messages.
Turn your email into colorful, visual tiles you can explore with your fingers or mouse. Rich 3D visualizations and familiar gestures make TouchMail the fastest and easiest way to keep your inbox clean and keep import.
United States
