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), Claws Mail (Free, Open Source) and Feedly (Freemium).

    This page was last updated Sep 14, 2021

    1. Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks. Moreover, 9 in 10 of our customers describe our interface as “intuitive” and beautiful.
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      Some users think Mailbird is a great alternative to Thunderbird, some don't.
    2. 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.
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      K-9 Mail vs Thunderbird opinions
      Most users think K-9 Mail is a great alternative to Thunderbird.
       all • positive • negative      relevance • date
      K-9 Mail works on Android, can use POP3 or IMAP and is easy to use. It's open source with no adverts.
      Top positive comment  over 4 years ago

      12
      open source, stable, essentially bug free, low on resource need, just e-mail without "cool" extra functions you never use.
      Top positive comment  over 3 years ago

      8
      wrong platform. K-9 is for android, Thunderbird is not, so K9 is not a valid alternative for Thunderbird users
      Top negative comment  12 months ago

      7
      Philippe_Hellmuller So far, I dislike the presentation which doesn't allow me to have a global view on my messages and possibly even different accounts. I'm also missing contacts and contact groups. The application looks very much like Outlook that I don't appreciate because of its presentation.
      Positive comment 9 months ago

      -1
      Bacma Very pratic and user-friend, but it is too much simple, not personalizable.
      Positive comment about 1 year ago

      -2
      Schnatt_App If you seek an alternative for thunderbird, this is the best
      Positive comment over 1 year ago

      -3
      No adverts, configuration is simple and it has black mode,it also works on android 10.
      Positive comment over 1 year ago

      -1
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      7 of 15 comments


    3. eM Client is a full featured email client with a clean and efficient user interface.
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      eM Client vs Thunderbird opinions
      Most users think eM Client is a great alternative to Thunderbird.
       all • positive • negative      relevance • date
      Thunderbird is brutal, emClient is clean, neat, well thought out, etc. It works with Exchange, Gmail, etc. Everything in one install. Drop in replacement for Outlook at a fraction of the price for Business.
      Top positive comment  about 4 years ago

      5
      podecre Best solution for people who use Google Calendar.
      Top positive comment  over 5 years ago

      -2
      limited to only 2 accounts
      Top negative comment  21 days ago

      1
      eM client is clean and neat, it's has more built-in functions than Thunderbird. This is a great alternative for Mac and Windows users who care about the software user interface.
      Positive comment 9 months ago

      0
      Slow on rendering most email. My version of it doesn't show well unread new message : I can't tell if it's too slow or if it just fails to display them at all.
      Negative comment almost 2 years ago

      3
      I'm still testing it but I like what I see. The interface. I like balance, not minimalism nor clutter. I am still using Thunderbird and have not decided yet. Also it is for personal use, therefore I need a free program with at least 3 free mailboxes.
      Positive comment over 2 years ago

      -6
      Renders HTML mail very slowly on Win10
      Negative comment over 3 years ago

      9
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      7 of 9 comments
    4. Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
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      Evolution vs Thunderbird opinions
      Most users think Evolution is a great alternative to Thunderbird.
      Has a nice Gui, works fast and has many options. Still some functions are not intuitive. Good alternative to Thunderbird
      Positive comment 5 months ago

      0
      well, I use cinnamon desktop, Thunderbird does not display 24 hour format but AM/PM for starters. Also, I use the built-in acount manager and Thunderbird does not "talk" with that as well.. Evolution does sync my CALDAV and CARDDAV from this. Thunderbird needs plugins for this and these plugins also make Thunderbird unstable (lightning). Since I like to keep things "clean", Evolution is my software of choice ATM...
      Positive comment over 1 year ago

      -2
    5. Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability
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      Claws Mail vs Thunderbird opinions
      Most users think Claws Mail is a great alternative to Thunderbird.
      3psilon It's a good, lightweight alternative, but the UI is clunky and it misses HTML message composing. You have been warned!
      Top positive comment  about 4 years ago

      14
      jodumont Despite the style, Claws is super fast and allow you to programs it with Perl and Python which is great for marketing automation.
      Top positive comment  about 2 years ago

      8
      No HTML compose is the only reason I don't switch to it. We're not in 1980 anymore.
      Top negative comment  almost 3 years ago

      13
      very good alternative under linux. I can not say the same under windows since fancy plugin is very buggy.
      Positive comment over 1 year ago

      -1
      Much faster than thunderbird which cloaks on weak machines.
      Positive comment over 3 years ago

      6
      Small and quick and not flooded with choices!
      Positive comment about 5 years ago

      2
      I like it because of easily customizable key bindings.
      Positive comment over 5 years ago

      0


    6. Feedly is a better way to organize, read and share the content of your favorite sites. It weaves the content from the RSS feeds of your favorite websites into a fun magazine-like experience and provides seamless integration with social networks.
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      This alternative is disputed. Feedly is still a legitimate alternative to Thunderbird, but it might have issues that some users think are important.
    7. Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks. Moreover, 9 in 10 of our customers describe our interface as “intuitive” and beautiful.
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      Mailbird vs Thunderbird opinions
      Some users think Mailbird is a great alternative to Thunderbird, some don't.
      Mailbird is missing most of the features which Thunderbird offers, like encryption and plugins
      Negative comment over 5 years ago

      9
      pasiojunk Clean interface, much faster than Thunderbird. One touch unsubcribe is a nice touch and adding new accounts is a breeze
      Positive comment 4 months ago

      0
      Great design. Great features
      Positive comment 5 months ago

      0
      thiztatyanarein asone user said "Mailbird is missing most of the features which Thunderbird offers, like encryption and plugins" more than year ago: now Thunderbird is dead, no development, no plugins (never was a lot and now even less as they are following the plan as to with Firefox. Is dead. Loved thunderbird, not a fan of Mailbird! but I can't stand oputlook
      Positive comment about 4 years ago

      0
    8. Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
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      Microsoft Office Outlook vs Thunderbird opinions
      Some users think Microsoft Office Outlook is a great alternative to Thunderbird, some don't.
      outlook is clumsy and bloated and does nothing well. tbird does one thing and well.
      Negative comment over 1 year ago

      3
      It works. Much less buggy. Better integration with Windows. Encryption/Signing.Works over remote desktop without losing pieces of itself. Search is crappier though.
      Positive comment over 1 year ago

      2
      Eyji As a Firefox user, I have tried to love Thunderbird but it just can't compete with Outlook, IMHO.
      Positive comment over 2 years ago

      2
      Outlook do not support RSS
      Negative comment about 5 years ago

      0
    9. Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.
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      SeaMonkey vs Thunderbird opinions
      Almost everyone thinks SeaMonkey is a great alternative to Thunderbird.
      SeaMonkey is both a WEB BROWSER and EMAIL CLIENT. It's the successor of Mozilla Application Suite or Netscape Communicator, resp. Further it includes also a news client program, an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla).
      Positive comment almost 4 years ago

      18
      apostolfaliagas It has all of Thunderbird's features and many more.
      Positive comment over 3 years ago

      13
      More of a web browser than an email client
      Negative comment over 2 years ago

      -6
    10. 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.
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      Mailspring vs Thunderbird opinions
      This alternative is disputed. Mailspring is still a legitimate alternative to Thunderbird, but it might have issues that some users think are important.
      riskaasmara Simple, more streamlined UI and easily customizable.
      Top positive comment  over 2 years ago

      3
      3psilon Great alternative, especially for casual users. Simple, streamlined UI, feels fresh.
      Top positive comment  over 3 years ago

      0
      Need to create an account on a third-party company to access your email.
      Top negative comment  almost 3 years ago

      48
      peterbro nice interface (if you are talking about the feature, kcontact/kmail is the best, but this has a nice interface)
      Positive comment over 3 years ago

      -2
      Very simple, perfect IU and possibility to follow what happen to your emails.
      Positive comment over 3 years ago

      -2
      bengotow Supports Linux and all IMAP providers, offers shortcut customization, extensible via plugins.
      Positive comment almost 4 years ago

      -3
    Showing 10 of 92 alternatives