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Best Thunderbird Alternatives

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 a leading Email Client 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, Evolution, Feedly and Claws Mail.

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. 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.

    ⚫︎ Dark ModeMailbird supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailbird.
    ⚫︎ Multiple Account supportMailbird support multiple accounts without the need to logout and login
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    Screenshot
    Mailbird vs Thunderbird opinions
    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.

    ⚫︎ Ad-freeK-9 Mail doesn't contain any form of external advertising.
    ⚫︎ Privacy focusedK-9 Mail is considered a privacy friendly alternative.
    ⚫︎ Multiple Account supportK-9 Mail support multiple accounts without the need to logout and login
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    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.

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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.

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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


  3. eM Client is a full featured email client with a clean and efficient user interface.

    ⚫︎ Multiple Account supporteM Client support multiple accounts without the need to logout and login
    ⚫︎ Dark ModeeM Client supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with eM Client.
    ⚫︎ Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    ⚫︎ Sync with Google CalendareM Client can be synchronized with Google Calendar
    ⚫︎ Automatic BackupeM Client will automatically back up your data periodically.
    Suggest and vote on features
    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

    Top negative comment   ago
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    3

    closed source program that doesn't do a lot of what thunderbird can

    Negative comment ago
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    0
    LinuxDoge

    doesnt support Linux, isnt open source, not configurable enough

    Negative comment ago
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    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.

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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
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    7 of 11 comments
  4. Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.

    ⚫︎ Calendar ViewEvolution has a built-in calendar view to have a clear overview of your content over time.
    ⚫︎ Multiple Account supportEvolution support multiple accounts without the need to logout and login
    ⚫︎ Sync with Google CalendarEvolution can be synchronized with Google Calendar
    Suggest and vote on features
    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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    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...

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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.

    ⚫︎ Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Feedly.
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    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. 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.

    ⚫︎ LightweightClaws Mail consumes less device resources compared to similar apps.
    ⚫︎ Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
    ⚫︎ CustomizableClaws Mail is easy to customize with themes or similar features.
    ⚫︎ Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
    Suggest and vote on features
    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
  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.

    ⚫︎ Dark ModeMailbird supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailbird.
    ⚫︎ Multiple Account supportMailbird support multiple accounts without the need to logout and login
    Suggest and vote on features
    Screenshot
    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 ago
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    9
    pasiojunk

    Clean interface, much faster than Thunderbird. One touch unsubcribe is a nice touch and adding new accounts is a breeze

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    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

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    -1

    Great design. Great features

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    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.

    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Office Outlook.
    ⚫︎ Multiple Account supportMicrosoft Office Outlook support multiple accounts without the need to logout and login
    ⚫︎ Dark ModeMicrosoft Office Outlook supports dark mode for comfortable usage in low light conditions.
    Suggest and vote on features
    Outlook 365 on Windows
    Microsoft Office Outlook vs Thunderbird opinions
    Some users think Microsoft Office Outlook is a great alternative to Thunderbird, some don't.

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

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    2
    Eyji

    As a Firefox user, I have tried to love Thunderbird but it just can't compete with Outlook, IMHO.

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    3
    LinuxDoge

    Not open source, not privacy-focused, no Linux support

    Top negative comment   ago
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    0

    outlook is clumsy and bloated and does nothing well. tbird does one thing and well.

    Negative comment ago
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    3

    Outlook do not support RSS

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    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.

    ⚫︎ CustomizableSeaMonkey is easy to customize with themes or similar features.
    ⚫︎ LightweightSeaMonkey consumes less device resources compared to similar apps.
    ⚫︎ Privacy focusedSeaMonkey is considered a privacy friendly alternative.
    ⚫︎ PortableSeaMonkey can be used from a USB stick or similar with no prior installation.
    ⚫︎ Extensible by Plugins/ExtensionsSeaMonkey can be extended with add-ons, plugins and extensions.
    Suggest and vote on features
    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
  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.

    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailspring.
    ⚫︎ Dark ModeMailspring supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Multiple Account supportMailspring support multiple accounts without the need to logout and login
    ⚫︎ CustomizableMailspring is easy to customize with themes or similar features.
    ⚫︎ Ad-freeMailspring doesn't contain any form of external advertising.
    ⚫︎ Extensible by Plugins/ExtensionsMailspring can be extended with add-ons, plugins and extensions.
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    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.

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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.

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    -3
Showing 10 of 96 alternatives