Best Thunderbird Alternatives in 2021

    Thunderbird is described as 'free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox' and is one of the leading apps in the News & Books category. There are more than 50 alternatives to Thunderbird for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is K-9 Mail, which is both free and Open Source. Other great apps like Thunderbird are eM Client (Freemium), Evolution (Free, Open Source), Feedly (Freemium) and Claws Mail (Free, Open Source).

    This page was last updated Jun 24, 2021

      • FreemiumProprietary
      • Windows
      Clyton is an email client with advanced security and spam filtering features. Although priced for the general public, Clyton possesses the reliability and security required by businesses.
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    1. 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.

      Discontinued

      Development of KOMA Code apps stopped in January 2017. Last version of Koma-Mail, 3.83, released in March 2012, can be still downloaded from the official website.

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      • FreemiumProprietary
      • Windows Mobile
      • Android
      • Symbian S60
      • Android Tablet
      ProfiMail is a powerful email client for mobile phones. It allows you to read your mail on the go, and send text with attachments directly from your phone. Send photos, recorded sound or simply text messages to friends, from anywhere.
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      ProfiMail vs Thunderbird opinions
      pros, cons and recent comments
      wrong platform - profimail is for mobiles, thunderbird is for desktops
      Negative comment 10 months ago

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    2. TrulyMail is an email client and a private messaging system, very feature rich (voice recording, script blocking, etc.).

      Discontinued

      The program is no longer developed. Last version, 6.0.2, released in January 2017, can be still downloaded from SoftPedia.

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    3. HCL Notes (formerly IBM/Lotus Notes) is the email client software that gives teams access to email, calendar and contact management capabilities, and seamlessly integrates other collaboration tools and Domino business applications.
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      • FreemiumProprietary
      • Windows
      OE Classic is an email and Usenet reader designed to be a perfect replacement for Outlook Express, Windows Mail, Windows Live Mail and even Mozilla Thunderbird.
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      • FreeOpen Source
      • Linux
      • Xfce
      Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client.
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      • Windows
      Agent is a powerful newsreader and email program for managing your communications: * Multiple News Servers · Agent makes it easy to automate access to all your News Servers and NZB Sites while minimizing your connection costs.
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    4. InScribe is a small and fast email client with an intergrated contact database and calendar. InScribe is the PRO version with UNLIMITED Receive Accounts and Email Identities i.Scribe is free version ... with limitations.
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    5. GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.
    Showing 70 of 89 alternatives