Linux Desktop Email Clients Compared: Thunderbird vs. Evolution vs. KMail vs. Claws Mail

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Looking for a Linux email client? Here’s a breakdown comparing the four best options.

Webmail use is still on the rise, and it’s not hard to understand why. There’s Gmail’s webmail-specific features, the ability to always see all of your email, and the convenience of viewing your email anywhere with just a browser and login credentials are just a few reasons why people have made email clients (outside of enterprise environments) almost obsolete.

These advantages aside, there are still enough reasons to use a desktop email client as well. Some include desktop integration features such as system notifications for new emails (this is most common on Linux, anyways), offline email management (especially if you don’t use Gmail with Google Chrome), and integrated encryption support.

While Linux isn’t graced with the presence of all email clients (I’m looking at you, Postbox), there are still more than enough options to satisfy the average email user. I compared the top four choices — Thunderbird, Evolution, KMail, and Claws Mail — to see what type of users they cater to.


Thunderbird is the most common email client for practically any operating system. Developed by Mozilla, Thunderbird hasn’t actually seen any recent major updates because Mozilla has shifted most of its development efforts to Firefox. This could be attributed to the gradual decline of email client use or a simple lack of innovative new ideas to be implemented into an email client. While Google has been innovating email with features such as Priority Inbox, they require a lot of processing power, along with proprietary algorithms, that desktop email clients like Thunderbird can’t use. The software still gets security updates (the version at time of writing is 17.0.8), but there hasn’t been a new major release in a while.

Thunderbird provides great features, such as an easy setup wizard (which usually guesses all the correct settings using only your email address and password), a great extensions system that cannot be rivaled, and a high level of customizability.

While Thunderbird is simply a respectable email client with its base features, it really flourishes once you add some extensions. Some of my favorites include extensions that add GPG/PGP email encryption, a visual thread view of email threads, and “Lightning” which adds calendar support to Thunderbird.

Ubuntu users can enjoy desktop integration with Thunderbird thanks to some self-developed packages — Thunderbird is Ubuntu’s default email client. Users of other distributions will have to find their own solutions or miss out on desktop support.

Users can take advantage of our shortcuts cheat sheet for Thunderbird, if they want.


Evolution is the default email client for most Gnome-based distributions. As mentioned above, some distributions like Ubuntu have other default preferences (like Thunderbird), but any distribution which sticks to pure Gnome experiences will include Evolution. Fedora, openSUSE, and Debian are great example distributions where this is the case. Either way, if Evolution isn’t installed on your system, you can easily find it in your respective package manager.

While Evolution was previously known to be slow and buggy, it  improved quite a bit over the lifespan of Gnome 3. It includes support for all major email protocols, as well as fairly decent support for Exchange servers (a feat none of the other three email clients listed here can claim).  It also has an easy-to-use interface (in my opinion it looks somewhat similar to Outlook), and support for calendars, task lists, and memos/notes without the need for extensions.

While certainly customizable, it isn’t nearly as customizable as Thunderbird. My primary reason for saying this is that Thunderbird does an excellent job of letting you choose different settings for each mail account that you have configured. Evolution’s settings, by way of contrast, apply to all mail accounts — which is an issue if you want , say, one account’s replies be written at the bottom instead of the top. Evolution also provides great desktop notifications for Gnome Shell GNOME 3 Beta - Welcome To Your New Linux Desktop GNOME 3 Beta - Welcome To Your New Linux Desktop Read More users. It is a very solid choice for a desktop email client.


KMail, similarly to Evolution, is the default email client for the KDE desktop environment Enjoy A Clean, Improved Desktop With KDE 4.7 [Linux] Enjoy A Clean, Improved Desktop With KDE 4.7 [Linux] One of Linux's most popular desktop environments, KDE, released their latest series (version 4.7) at the end of July. This version improves on work done in previous releases by adding new features while improving performance... Read More , except where otherwise replaced by specific distributions. KMail integrates very tightly into the desktop and other KDE applications — the KDE PIM, or Personal Information Manager, handles accounts used by KMail, the KDE IM application, and other elements found in the Kontact application. If you don’t already have KMail or other KDE PIM applications installed, it’ll be really hard if not impossible to get KMail on your system.

While the interface isn’t quite as friendly as Thunderbird or Evolution, the application is still very functional and configurable. It also supports all of the major email protocols, so you shouldn’t have any issues with getting started with KMail. For more information, you can check out our more detailed article about KMail KMail - A Different Kind Of Email Client For KDE [Linux] KMail - A Different Kind Of Email Client For KDE [Linux] People use various tools to manage their email, the two most popular being the Gmail website and the Thunderbird desktop app. However, today we'll be looking at a top KDE choice that has plenty to... Read More .

Claws Mail

Claws Mail is an email client found as the default in a number of lightweight distributions. Compared to the other three options, Claws Mail is by far the most resource-friendly email client — and it shows. While the application is still quite functional, the interface looks simpler and stripped down — and features like easy setup aren’t present.

Even the icons seem like they would be more appropriate for the 90’s, but then again functionality is more important than looks for some people (especially the resource-conscious ones). Claws Mail continues that simplicity by only showing email in plain text (I’m sure as a security measure). However, Claws Mail does allow for plugins which can be installed via available packages and loaded via Configurations –> Plugins. It still supports POP3, IMAP, and SMTP, so it’s a great quick choice if you like and/or need a solution like this.

Looking through your respective package manager with the search term “claws” should lead you to a Claws Mail package that includes the application. You can also install other plugins that may pop up in the list, but none are required. Just know that if you do install any that you also need to load them while inside Claws Mail as outlined above.


My ultimate winner is Thunderbird — mainly for its large user base and  an extensions system that give it all sorts of extra features. However, I’d easily recommend any of these email clients. The only situations I wouldn’t recommend would be to install Evolution on a KDE system or KMail on a Gnome system. Otherwise, feel free to install whatever you like.

Do you use webmail or an email client? Why or why not? Let us know in the comments!

Image Credits: Penguins Via Flickr

Explore more about: Desktop Email Client, Email Tips, IMAP, Mozilla Thunderbird.

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  1. Sandro
    August 25, 2019 at 2:29 pm

    I have. Been using evolution and have been happy with it on, my ubuntu based distro of Bodhi ( light weight ) version of linux on a netbook. Then again I only use one E-mail account it started as POP on my work E-mail system, then changed to IMAP. It changed well. As mentioned it does resen ble out look and can import outlooks .PST data. I did this on another laptop that was dual boot with WIN7 and Linux Mint. First herd about evolution from Z-net, and have liked it ever since.

  2. Serge Alekseev
    July 20, 2017 at 6:38 pm

    Claws mail. One and only.

  3. Ian Slater
    October 18, 2016 at 8:36 am

    I'm hoping to switch my internet use to Linux, leaving windows for specialist off-line programs like Lightroom. But I can't get email. I've used Thunderbird on Windows for years (it's the only effective option other than the costly Outlook) but it won't install on Ubuntu. The "Wizard" simply fails to connect and requires deletion of the Thunderbird folder before each attempt. I can't copy the settings manually from my Windows installation as the set-up boxes are quite different. I'm concerned that Thunderbird is presented here as an easy option. Can anyone suggest an easy alternative, other than signing up to Google for Gmail and losing old contacts? Thanks

    • nunya
      March 15, 2017 at 1:25 pm

      tell the tbird wizard that you will set the server settings manually(button bottom left right before it starts auto-guessing). then, if you set everything correctly, it will work fine. it sounds like the auto guesser is just guessing wrong. it's not a big deal. Be aware that everything will seem hard and you'll be whining and griping a lot for a while when first moving from windows to linux. this is a normal phase. This is just a reaction to having to use your brain to learn and think. You have been trained by windows to be a dependent slave, while gnu+linux expects that you are a free, thinking human being. If you make it past this stage you will look back and laugh/be a little embarrassed. At least this is what happens to many people, myself included. Welcome to free humanity and hang in there!

  4. César Telmo Oliveira Costa
    February 6, 2016 at 12:20 pm

    I'm using Ubuntu 14.04 in office (a public portuguese hospital) with Thunderbird client and DAV gateway for Exchange OWA communication. Very good option last 5-6 year.
    In my personal laptop with Fedora 24 distro i'm using Thunderbird too with two different accounts: gmail and a University of Aveiro one. I'l try one of these days Evolution!...
    Telmo (Aveiro, Portugal)

  5. Peter Flynn
    January 12, 2016 at 9:36 pm

    I never use web-based email (lack of a Redirect button is the prime reason, followed by the uncontrollable ghastliness of the interfaces, and the insistence on top-posting and HTML gaudiness), so I found this helpful, a very good review.

    However, it misses mention of the excellent ExQuilla plugin which adds Exchange protocols to Thunderbird, ExQuilla's only drawback is that it's deathly slow (presumably because it's scripted). This is part of the reason why I'm going to investigate Evolution again, which I dropped long ago because it was hogging my entire system. Claws is good, but I need Exchange connections for accessing some systems that have IMAP/POP turned off.

    • Peter Flynn
      January 12, 2016 at 9:57 pm

      That was a waste of time...Evolution doesn't support Exchange after all: no trace of it in the setup for my Exchange accounts. Back to Thunderbird...

      • Delirium
        January 30, 2016 at 4:07 pm

        Install evolution-ews and be happy. However, you need the exchange web services, which are part of Outlook Web Access. Works like a treat for me.

        • Peter Flynn
          January 31, 2016 at 10:20 pm

          Thanks for the pointer. EWS is no problem, our corporate OWS has it. Now I just need to get my laptop back from being repaired..

  6. Nell
    December 21, 2015 at 5:08 pm

    Like many I have found Thunderbird a slow and frustrating email client. While Evolution is the closest alternative to Outlook I found it slow too. My choice is M2 the email client bundled in the older versions of Opera browser. Although it's quite old it's very fast to load and collect mail. I wishit had more than rudimentary contacts but apart from that I'm very happy with it.

    Opera themselves separated the mail client from the browser in Windows sometime ago and to date haven't created a linux version. However a possible successor called M3 is under development at Vivaldi browser, a team formed around the original Opera developers so fingers crossed we may get an update eventually.

  7. Attila Hooper
    November 20, 2015 at 2:55 am

    @Loren while I dont disagree, the only option is gmail ? ack, like the nsa on steroids.

  8. Anonymous
    August 31, 2015 at 2:52 am

    if thats the best the linux community can do when it comes to email clients, someone needs to do something seriously, every email client I have tried so far has been utter garbage. Thunderbird, Kmail,Evolution, Claws, Geary is the newcomer that could have some potential but it's not there yet. I have several tousands of mails on my accounts, and I simply cannot use any of these clients, what they all have in comon, is they are slooooow. to load my mail it will take hours and hours and even a whole day! where Outlook does it in just 5 minutes. none of these are a serious contender to Outlook, I wish someone would develope a faster alternative

  9. Anonymous
    June 26, 2015 at 9:57 am

    @Loren Dias
    What you're saying is just pure FUD :) I rely on e-mail communication rather heavily and I've switched from the web interface of Gmail to a desktop app specifically for the efficiency provided. It's much easier to get organised + much, much faster. I've initially tried Claws but couldn't exactly get it to co-operate with Gmail labels (though I've seen it's possible) but with Thunderbird everything works smoothly.

    • Loren Dias
      March 25, 2017 at 11:17 pm

      Fear, Uncertainty, Doubt?

      That is wrong. I was sharing my personal experience and disappointment after investing something like 10-50 hours into switching away from Gmail.

      It took 2 years but I finally have settled and Evolution has fixed numerous bugs which made it unusable for me before. Props to Gnome Evolution guys for winning me over.

  10. Loren Dias
    May 31, 2015 at 11:54 pm

    I'll save all the readers a lot of trouble - Thunderbird sucks. Evolution sucks. Geary sucks. Claws sucks, and the other 3 IMAP Email Clients - surprise? suck. Don't disrupt your workflow like I did in the hopes that X app can replace Gmail. After about a month and days wasted moving email across IMAP servers, email disruption has been the single biggest disruption to my workflow aside from data loss in my life. Don't do it - Thunderbird isn't under development by Mozilla like It was a couple years ago anymore. Evolution Mail 3.16? I hear the devs don't even use their own software. Geary? Not enough functionality to take seriously - almost, but not cigar. Take my advice, don't disrupt your workflow, don't do it.

    • Gio
      September 8, 2016 at 2:48 pm

      Sorry but to me Gmail sucks compared to Thunderbird. With TB I just have so many more options...not withstanding the plugins.

      Not quite sure how professionals can work with something so primitive like Gmail. Yet, that is just my experience and opinion.

    • nunya
      March 15, 2017 at 1:35 pm

      what are you talking about? you don't "move" imap emails. It works on a copy. That's the whole point of imap. You don't even mention what your actual problem is with tbird and evolution. Some of us don't want all of our private communication going through an arm of the surveillance state(google). Take your propaganda somewhere else.

    • Mark
      January 28, 2018 at 3:31 pm

      I use Sylpheed which is the more basic version of Claws. It's very fast and can handle thousands of emails.

  11. Boogie
    February 7, 2014 at 2:09 am

    The one and only is Evolution.
    Thunderbird sucks and ugly.

  12. vs
    October 25, 2013 at 7:44 pm


  13. vs
    October 25, 2013 at 7:44 pm

    geary how?

  14. Rusty Dixon
    October 20, 2013 at 5:04 am

    Well Thunderbird certainly isn't dead. You said at the time of writing (23 Aug 2013) that it was on version 17.0.8. As of my post (19 Oct 2013) Thunderbird is on version 24.0.1, released October 11, 2013.

  15. Efrain B. Garcia
    October 9, 2013 at 1:20 am

    Real nice review of email clients for Linux. I agree that Thunderbird is a very good email client and I use it when I am on my Linux computers. I would also like to let you know that you can use the Conversations Add On and it will get rid of the folders icons and the pane looks like GMail and the whole appearance of Thunderbird really looks good to include your email conversations, etc. Additionally you can install Postbox in Linux using the PlayOnUnix app to install and it really works well. I have been using Postbox with the Zorin distro for about two weeks with no problems. Again, thank you for your review.

  16. jose
    September 10, 2013 at 1:49 pm

    Thunderbird also works with Exchange using the davmail tools

  17. Alan
    September 2, 2013 at 8:56 pm

    I just started using Thunderbird for PGP and was delighted to discover it has a fantastic Twitter client built in, just about the only linux twitter client I could find that still works! Big thumbs up for Thunderbird.

  18. Howard Helbein
    August 24, 2013 at 12:30 am

    For those of us tied to Exchange servers, what are the options besides Outlook Web Access? I've tried to get the Thunderbird plugins working, but no success with Exchange 2010. A Thunderbird plugin that uses ActiveSync would be great!

    • Alucard
      August 26, 2013 at 10:39 am

      Your best bet with Exchange support is Evolution. Though, not perfect, I hear it's the best we've got for Linux.

      • Danny Stieben
        August 31, 2013 at 5:09 pm

        Yeah, Evolution seems to be the best solution for Exchange right now. I believe it still uses Outlook Web Access, but as far as I know you won't really be able to tell the difference. (As long as your Exchange server offers OWA.)

    • Vadim P.
      October 15, 2013 at 5:07 am

      ExQuilla works pretty well and is under active development (and is actually getting itself a funding model, which means you can trust it to be less flaky than another addon).

    • Scott Alfter
      December 16, 2014 at 8:07 pm

      >For those of us tied to Exchange servers, what are the options besides Outlook Web Access?

      You might want to look into DavMail:

      It's a cross-platform translation layer between OWA and standard procotols (IMAP, SMTP, the various *DAVs, etc.) that will let you use whatever email client you want to talk to an Exchange server. I use it at work with Thunderbird and Lightning for email and calendar access. I run it on Windows as an alternative to the steaming pile of fail that is Outlook, but since it's Java, it should run on anything.

  19. Dan
    August 24, 2013 at 12:10 am

    I use TBird because of its extensive addons library. But personally I prefer Sylpheed.

  20. TechnoAngina
    August 23, 2013 at 7:44 pm

    Really good breakdown of the different email clients. I'd really like to see some visual updates to Thunderbird and I'm not super sure I enjoy the different Chrome/Office 2010 like tabs, but it's easy to get used to. I'd like to see some work done on better mail visualizations and better calendar/ tasks integration as calendars and task management always seem to be an afterthought in Linux applications. It might be nice to see a cleaner interface somewhat like inky or Alto mail.

    • Danny Stieben
      August 31, 2013 at 5:07 pm

      Sadly, Thunderbird won't be getting any of that anytime soon since Mozilla has suspended development of Thunderbird except for maybe the occasional security update.

      • TechnoAngina
        September 1, 2013 at 4:38 pm

        Then I guess I could always just quit complaining and do it myself. It is open source. I'm not really a fan of the whole everything in the cloud concept. How email isn't better organized by now is a mystery to me.