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Free Thunderbird Alternatives

The best free alternative to Thunderbird is K-9 Mail, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunderbird and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Thunderbird are eM Client, Evolution, Claws Mail and Feedly.

Thunderbird alternatives are mainly Email Clients but may also be Calendar Apps or Email Organizers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Thunderbird.
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Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is...

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  1. 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.

    Screenshot
    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   ago
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    12

    open source, stable, essentially bug free, low on resource need, just e-mail without "cool" extra functions you never use.

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    8

    wrong platform. K-9 is for android, Thunderbird is not, so K9 is not a valid alternative for Thunderbird users

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    14
    LinuxDoge

    I used FairEmail before, which is also awesome. K9Mail has awesome integration of "OpenKeyChain", which is also FOSS and enables PGP encryption also apart from the mail program, so actually an advantage.

    K9-Mail has easy switches between profiles, a stunning modern GUI and easy support for "PGP encrypt" vs "just sign" with one click.

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    0
    GadGray

    K9 is only an alternative for android devices.

    Negative comment ago
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    2
    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 ago
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    -1
    Bacma

    Very pratic and user-friend, but it is too much simple, not personalizable.

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    -3
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    7 of 17 comments
  2. eM Client is a full featured email client with a clean and efficient user interface.

    eM Client: Inbox view
    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.

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    5

    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.

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    0

    limited to only 2 accounts

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    3
    LinuxDoge

    doesnt support Linux, isnt open source, not configurable enough

    Negative comment ago
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    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.

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    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.

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    -6

    Renders HTML mail very slowly on Win10

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    7 of 10 comments


  3. Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.

    Mail
    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

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    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...

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    -1
  4. 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.
    The main window
    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!

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    14

    Much faster than thunderbird which cloaks on weak machines.

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    6

    very good alternative under linux. I can not say the same under windows since fancy plugin is very buggy.

    Positive comment ago
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    -1
    jodumont

    Despite the style, Claws is super fast and allow you to programs it with Perl and Python which is great for marketing automation.

    Positive comment ago
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    8

    No HTML compose is the only reason I don't switch to it. We're not in 1980 anymore.

    Negative comment ago
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    14

    Small and quick and not flooded with choices!

    Positive comment ago
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    2

    I like it because of easily customizable key bindings.

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    0
  5. Feedly icon

    Feedly

    • FreemiumProprietary
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Kindle Fire
    • Firefox

    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.

    Screenshot
    Feedly vs Thunderbird opinions
    This alternative is disputed. Feedly is still a legitimate alternative to Thunderbird, but it might have issues that some users think are important.
    LinuxDoge

    not an email client and not open source

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    0
    anishbrizzo

    It's not an email client.

    Negative comment ago
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    0


  6. 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.

    Clean design with integrated search and swipe gestures
    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.
    3psilon

    Great alternative, especially for casual users. Simple, streamlined UI, feels fresh.

    Top positive comment   ago
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    1

    Very simple, perfect IU and possibility to follow what happen to your emails.

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    -1
    Su900

    Unable to even find an address book or ability to import a csv file from previous mail client. You lose me when things are made so "modern-clean" that I have to consult a manual or Google things.

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    0
    riskaasmara

    Simple, more streamlined UI and easily customizable.

    Positive comment ago
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    4

    Need to create an account on a third-party company to access your email.

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    52
    peterbro

    nice interface (if you are talking about the feature, kcontact/kmail is the best, but this has a nice interface)

    Positive comment ago
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    -3
    bengotow

    Supports Linux and all IMAP providers, offers shortcut customization, extensible via plugins.

    Positive comment ago
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    -3
  7. Geary is an email application built around conversations, for the GNOME 3 desktop.

    Main window
    Geary vs Thunderbird opinions
    Some users think Geary is a great alternative to Thunderbird, some don't.

    Doesn't have an address book

    Negative comment ago
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    1

    Easy to set up. Thunderbird doesn't connect anymore with hotmail and yahoo. No address book.

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    -21

    Only IMAP. No support for local folders.

    Negative comment ago
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    1
  8. 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.

    Linux version browser
    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 ago
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    20

    Unfortunately doesn't support synchronization with CardDAV address books.

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    0
    apostolfaliagas

    It has all of Thunderbird's features and many more.

    Positive comment ago
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    14

    More of a web browser than an email client

    Negative comment ago
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    -7
  9. FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.

    Compose message view.
    FairEmail vs Thunderbird opinions
    Most users think FairEmail is a great alternative to Thunderbird.

    wrong platform. FairEmail is not an alternative for Thunderbird users because it only runs on android. Thunderbird is for desktop operating systems only.

    Negative comment ago
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    -4
  10. E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.

    Screenshot
    Spark Mail vs Thunderbird opinions
    Most users think Spark Mail is a great alternative to Thunderbird.
    rmpbklyn

    no sorting, dont show allmail for gmail

    Negative comment ago
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    -3
    folkomaton

    Free, simple, reliable, easy to manage multiple accounts, fair amount of customization, synchronisation, templates

    Positive comment ago
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    0
Showing 10 of 76 alternatives