The best alternative to Thunderbird is Betterbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunderbird and 17 are so hopefully you can find a suitable replacement. Other interesting alternatives to Thunderbird are FairEmail, eM Client, KMail and myMail.
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.
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.
Looking for a full-featured email client with a modern and easy-to-use interface? Look no further than eM Client. Rated 3 out of 5, eM Client is a popular alternative to Thunderbird, offering all the features you need to manage your email, calendar, tasks, contacts, notes, and chat all in one place.
With support for IMAP, calendar integration, and multiple accounts, eM Client is the perfect choice for users who want a robust email client that can handle all their needs. Whether you're using Windows or Mac, eM Client is the most popular proprietary alternative to Thunderbird, offering a powerful and flexible solution for managing your email and staying organized. Give it a try today and see why so many users are making the switch to eM Client.
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.
myMail is the smart email app for managing all your accounts on iOS and Android.
Engineered for iOS, macOS, and watchOS, this fast mail client supports multiple account types, custom actions, Smart Inbox filtering, unified inbox, privacy mode, email scheduling, snooze, third-party app integration, flexible personalization, and advanced workflow tools.
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
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.
mu is a tool for dealing with e-mail messages stored in the Maildir-format, on Unix-like systems. mu's main purpose is to help you to find the messages you need, quickly; in addition, it allows you to view messages, extract attachments, create new maildirs, …
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Betterbird does everything that Thunderbird does (it's a soft fork), while improving bugs and features.
Because it's a soft fork, it retains the security implementations of Thunderbird.
Thunderbird actually implements many of the bug fixes created by Betterbird, but at a much slower pace.