After reading a bunch of negative comments here, let me add a little on the bright side. I've been using Thunderbird for many years, currently both at home and at work to manage gmail accounts, pop at home, imap in the office. It works great for me, with a few annoyances but nothing serious.
As for the donations, Thunderbird seems to be somehow apart from Mozilla now, so I don't think much about specific org structure and will gladly donate.
Maybe on paper there're dozens of alternatives, but when I consider my specific requirements, I haven't found anything better, YMMV.
I use Thunderbird from the beginning when it was still named Firebird (I switched from Outlook Express). I think that it's a good product because it continues to do the job since more than 20 years. Me too I don't understand the negative comments. It's free (MPL license), it's packaged by Debian. All good. I don't care about Mozilla.
I just check something because my memory as faults... Firebird was the name of Firefox and the mail client was called something like Mozilla mail or something else.
Yeah it's all a bit complex (just like the US tax code, I suppose). MZLA (which makes Thunderbird) is a subsidiary of the Mozilla Foundation. The Mozilla Corporation (which makes Firefox) is also a subsidiary of the Mozilla Foundation. In practice, this means that the people running Firefox day-to-day aren't the people running Thunderbird day-to-day, although of course they do talk, and technology choices made in Firefox can and do effect Thunderbird, just like they effect e.g. Zen Browser or Tor Browser.
(Also, someone help a non-native speaker: I think the "effect"s above should be "affect", but for some reason that looked wrong here. Why is that?)
Likewise. Long time Thunderbird user since the original 1.0 days, for both work and personal use.
There's been a few ups and downs along the way but I've found it generally "just works" and gets out the way, which is exactly what I want in an email client.
I've tried almost every single email client I could find on Linux, and several on Windows (including Pegasus mail, if anyone remembers that), but always come back to Thunderbird.
I've been a regular donator to the project ever since they spun it out to MZLA Technologies Corporation.
I've been using Thunderbird for my email for a very long time. Probably since some early 1.0 release.
In these years, I've also had it on Windows and Linux, I've migrated it easily across many OS installs and hardware changes, I've used it with different kinds of email accounts and servers. It's worked with PGP encrypted mail, with SpamAssassin on the server and more.
It's great. It doesn't change much, which is probably a good thing, Firefox lost me as a user at some point. Thunderbird mostly stays the same, adding features occasionally. As I write this, I realize I'm so used to Thunderbird I'm not even sure what other clients are available. Definitely one of the best programs I've used.
It's bad enough so many of us have to get our emails through them. Adding even more tracking on top of that… No, thank you. I don't want all my scroll positions on all my emails to be logged in their database forever.
Campaigns like this need more info. This page doesn't answer any basic questions.
How much money do you currently get? How much money do you need and how will you use it? Does it even go directly to Thunderbird development or will be used up by Mozilla for other projects?
Still, my point stands that communication around it should be super clear and available on all pages where they collect money. It shouldn't require me to search for it.
They are not entirely separate from Mozilla. The MZLA Technologies Corporation is a for-profit subsidiary of the Mozilla Foundation. They have access to some of Mozilla's common infrastructure, but are otherwise entirely funded by donations. Donations to MZLA only fund Thunderbird and no other products.
Just donated. Have been using Thunderbird for years. I once donated to Wikipedia - and they have billions I heard - so might as well donate to another important piece of software for my digital life.
Now that I read the comments I find out Mozilla might have enough money and a CEO taking in millions. Any recommendations for a good email client on Linux? Just as a backup for now...
Mozilla Corporation may have enough money, but they don't develop Thunderbird. If you used the donation form on this page, you didn't donate to Mozilla Corporation, but to the company developing Thunderbird. So all is fine.
> MZLA Technologies Corporation is a wholly owned for-profit subsidiary of the Mozilla Foundation and the home of Thunderbird.
I guess I don't understand why the open-source email client with zero revenue potential is managed by a for-profit subsidiary, nor why that for-profit subsidiary is begging for donations.
Shouldn't this whole thing be managed by the non-profit Mozilla Foundation?
I don't see them begging anywhere, I only see someone sharing a link to their donate page.
For what it's worth because legal names are confusingly similar, this is a legal subsidiary of Mozilla that is specific to Thunderbird, as in if you give it money it goes straight into Thunderbird. Many people here pretend to wish to be able to give money directly to Firefox, yet when they can do that for Thunderbird, people here are still finding bullshit reasons not to do so. Pick a lane.
> For what it's worth because legal names are confusingly similar, this is a legal subsidiary of Mozilla that is specific to Thunderbird
Right, I get that, but why is it for-profit? Fund raising is hard enough for nonprofits, convincing people to donate their hard-earned cash to a for-profit is on a whole different level.
One thing that's important to note (which holds for the Mozilla Corporation too) is that the for-profit thing is a legal status, but the Foundation (an official non-profit) is the only shareholder, i.e. the only entity that "profit" can flow to. So you're not lining some billionaire's pockets.
(Though of course, employees of either entity can be paid whatever, which also holds for every other non-profit.)
I'm definitely not involved with any of them to know for sure, but my guess would be that's because non-profits come with a lot more regulatory overhead in comparison to for-profits of a similar scale. Not saying that's bad in any way, but for a team that just wants to build the damn thing, for-profits are absolutely less of a hassle.
Not that it answers your question, but the move happened in 2020 to "hire more easily, act more swiftly, and pursue ideas that were previously not possible".
This is just organizational structure. "For-profit" doesn't mean "profitable". Also, the organization is "wholly owned" by a non-profit, so if there are profits declared in the form of dividends, those dividends are sent to the non-profit.
Note that many non-profits have exceptionally high-paid executives and "contractors".
Regulatory requirements on non-profit organizations are very high, and those organizations are, in fact, very limited in what they can do and how they receive their money. There are very good reasons for a non-profit to own for-profit entities, and, similarly, for philanthropic organizations to organize as for-profit entities.
Interestingly, I used Thunderbird for years, it was really the best client for some times on Linux. But as the development stalled, I moved to Gnome Evolution, the nice integration with the general Gnome desktop made the switch less painful (at the start, it was hard, Evolution was not that good). But Evolution improved nicely, less bugs, faster, still well integrated into the desktop and I see no reasons to switch back to another tool.
The only change in my workflow is that now, I am also using in parallel a stupid command line tool "vibe coded" in Python to read my emails. It allows me to quickly check my emails out of VS Code in a Claude Code session, a bit like when I was doing my emails directly in Emacs :-)
Thunderbird will provider their PRO services using stalw.art as email backend. I was considering using it too to replace really old mail system in our company. It looked like modern stack using jmap, but it seems thunderbird actually does not support jmap? Or is it only in their PRO extension? Does it mean I cannot use this unless it is with their services? I'm confused.
Of course there is still IMAP, but I hoped for better.
That's basically how you could describe what happened. Those competent people are using Mozilla's infrastructure and trademarks, but otherwise running on donations.
What do they do with all that money? According to wikipedia, they had about 750 employees. That's a lot of employees for the amount of useful products they have.
How did you come to the conclusion that 750 people is a lot to build a web browser? The Chrome-adjacent teams at Google are about 4,000 people, and that doesn't even include all the people at Google providing infrastructure (e.g. servers, workplace, HR, legal etc.).
Comparing Firefox to Chromium-based browsers doesn't make much sense since these browsers don't develop their own web engine.
I wish there was a system that lets users put up a donation that is released once a specific bug is fixed or a specific feature is implemented.
Wouldn't that be cool? The company would have a list of tasks with a dollar amount next to it.
I for one have been dabbling with a bug in ThunderBird for days now that drives me mad:
I recently created a folder in Thunderbird and called it "archive". No way would I have expected that this will lead me to a bug and will take hours out of my day: There seems to be no way to get rid of this folder anymore.
Things I have tried:
"Keep message archives in" in "Copies and Folders" is disabled. I tried temporarily enabling it, setting it to some other dir and disabling it again, that did not help.
I have disabled it in "subscribe".
I cannot rename it.
There is no "archive" folder in the web interface of my email provider, so if it Thunderbird somehow created it on the server, there seems to be no way to see, let alone delete it again in the web interface.
I tried deleting archive.msf on disk. That makes the folder disappear after the next start, but it is recreated after about a second.
I deleted folderTree.json and folderCache.json, that did not help.
You can do that. It's called a restricted donation. If you make a donation with a cover letter or a check memoizing a specific purpose and the nonprofit accepts it, then by law they're legally obligated to follow through and use that money for that purpose. With bugs it's probably easier because you can just write the bug ID on the check.
There are also a couple of bug bounty websites out there for exactly this kind of thing: you and others throw some money into the pot for fixing a given bug or implementing some feature, and coders can claim that bounty once they've written the code.
I've seen a few of these sites over the years but I can't remember the name of any RN. Search engines are your friend.
I wish I could use Thunderbird at work now that it has Exchange support . Unfortunately we're mandated to use Microsoft Outlook. Outlook feels like it has completely been forgotten by Microsoft. I don't recall the last time they updated anything meaningful in the product (at least on macOS), it's quite a mess of a product. Wishing Thunderbird all the best it's the competition we need.
You know what is nice? If you have clients that get automatically switched to "the new Outlook" and loose all imap connections (and they don't work anymore, period).
Took me so long to learn that the fix was to switch back to the old Outlook.
IMAP works in outlook. Its just horrible to set up and half broken. Click "Add account". Then type in your email address, click "Choose provider", select IMAP, then click "Sync directly with IMAP" (dark pattern hidden button). If you don't click that last button, outlook uploads your IMAP email credentials to their own MS Cloud instance, and that proxies all your emails via microsoft's cloud servers. Do they read your email messages for advertising? Nobody knows!
In my testing, the local IMAP client implementation quite frequently launches a DoS attack against your IMAP server. It'll send the same query requesting new mail messages in a tight loop, limited by the round-trip latency. But luckily, almost nobody uses IMAP via outlook because its so difficult to set up.
There's also two different applications which are both "Outlook for Mac".
If you go into the "Outlook" menu in the app, there's a "Legacy Outlook" button, which relaunches outlook using a completely different binary. The two outlook implementations have different bugs and all sorts of different behaviour.
Outlook For Mac is free but "legacy outlook" requires a MS365 subscription for some reason.
Outlook is also not to be confused with Microsoft's "Web Outlook" client, available at outlook.live.com. It all seems totally insane.
If you press the browser’s back button on the donation page, they send you to a page pestering you for your email address so they can send you a reminder to donate later. Talk about a dark pattern.
Mozilla has really gone off the rails. An organisation who claims to work on behalf of the user and who makes a web browser, actively hijacking the user experience to peddle for a few dollars?
Why the heck is Thunderbird “fully funded by financial contributions from [their] users”? Where do the billions of dollars from Google go? All the stupid doomed side projects which no one asked for nor wants and are abandoned after one year?
The Mozilla Corporation then picks and chooses what it finances within the Mozilla Foundation. Their financial statements don't break down how they spend on software development within the Foundation, it only lists out employee salaries, specific directors' salaries and grants to outsiders... but it would seem Thunderbird doesn't get much if they're out begging.
- $66,396,000 from paid services (e.g Pocket, VPN) and advertisers
- $15,782,000 from donations
And it spent:
- $290,448,000 on programmer salaries
- $163,516,000 on manager salaries
- $36,358,000 on servers, cloud, etc.
- $20,258,000 on consultants (e.g. branding consultants)
- $9,573,000 on travel
- $2,192,000 on grants and fellowships
So overall, it didn't spent that much on the stupid doomed side projects! It spent a lot more on flying managers and marketing consultants to nice soirees.
But the real question, not answered by this financial report, is how much programming labour was spent on Thunderbird, versus other Mozilla projects?
My assumption would be that it's very little, given that Thunderbird was separated out of the Mozilla Corporation to MOZLA (or whatever it's called).
On the bright side, that actually makes me a bit keener about donating to it; donating to the Mozilla Corporation seems entirely pointless given donations make up ~2.5% of their income, and less than 10% of what they spend just on manager salaries, whereas giving it to Thunderbird might actually have a positive impact.
DO NOT donate to Thunderbird. Let it "die". As with all of Mozilla's software, that would be the best outcome - if it does, someone who isn't totally incompetent might fork it and actually improve it.
Literally every change that's been made to thunderbird in the last 10+ years has made it worse. Mozilla are doggedly using the same philosophy as they are with firefox: "in what new and exciting ways can we make it more shit?".
There are a bunch of things that I used to do in thunderbird with no problem on much less powerful machines that I can't do today.
For example, since they decided to rewrite their perfectly-functional calendar parsing in a trash language, it now eats 100% of my CPU for ~30mins at a time trying to parse my decades-long, many-many-thousands-of-entries calendar. Then when it finishes it notices that it's been 30 mins since it synchronised my calendar, so it syncs and starts parsing all over again! This effectively locks up the whole of thunderbird, making it totally unusable. This issue has persisted for years. The solution I came up with is "stop using thunderbird for my calendar".
There's a similar fun bug which means it won't sync my contacts anymore either. A feature that I had by about 2010 which my nokia phone could manage, modern thunderbird cannot do.
If you'd like another 20 examples of how it's worse today than it was 10 years ago, just ask, and I'll write up a hundred thousand words or so of vitriol.
It's extremely likely that next time I upgrade my distro I'll be shopping for a new email client. Currently I have thunderbird marked as held so that it doesn't upgrade. When I upgrade my distro there will be a new version of thunderbird, and I'd estimate about a 90% chance that that's when I'll make my exit, after ~20 years or so.
It's sad. Thunderbird used to be a great piece of software.
Mozilla is such a weird company, asking users to donate and keep one of their projects alive, while dumping billions in useless initiatives is really dishonest.
I use Thunderbird on both Linux/Android as my sole client for personal email. I'm mostly pretty happy with it, aside from search. My use case is mostly receiving email rather than sending email however. I would be much more amenable to donating if I knew that my donation would be going to support Thunderbird specifically and not rolled up into the parent MZLA Technologies Corporation, but I understand that's usually impractical.
How is KMail and Evolution at this point? I have not tried them in like 10 years. Are they actively maintained and a real alternative for serious email use?
Made an account just to say that I will not support the bloated mess that is Thunderbird that pushes on you a new way to configure it, a new layout and new workflows with every major update, makes it difficult to set up text-only mail and messes up line breaks every so often with no way to properly configure it, which should be developed by Mozilla, which is flush with money but rather spends it on theming their software and executive salaries.
I switched away from Thunderbird about a year ago and couldn't be happier I have made the change.
As for the donations, Thunderbird seems to be somehow apart from Mozilla now, so I don't think much about specific org structure and will gladly donate.
Maybe on paper there're dozens of alternatives, but when I consider my specific requirements, I haven't found anything better, YMMV.
https://en.wikipedia.org/wiki/Firefox#Name_changes
I don't think that's the case.
"Thunderbird is part of MZLA Technologies Corporation, a wholly owned subsidiary of Mozilla Foundation."
Thunderbirds sourcecode is literally part of the same mercury codebase as Firefox.
Thunderbird does have a very small team, and I think everyone that uses it should considering donating.
(Also, someone help a non-native speaker: I think the "effect"s above should be "affect", but for some reason that looked wrong here. Why is that?)
There's been a few ups and downs along the way but I've found it generally "just works" and gets out the way, which is exactly what I want in an email client.
I've tried almost every single email client I could find on Linux, and several on Windows (including Pegasus mail, if anyone remembers that), but always come back to Thunderbird.
I've been a regular donator to the project ever since they spun it out to MZLA Technologies Corporation.
Works perfect, I even migrated my Windows install to Linux just by copying the data folder, absolutely seamless.
Not sure why people are hating on it so much here. Point to an alternative with the same features?
In these years, I've also had it on Windows and Linux, I've migrated it easily across many OS installs and hardware changes, I've used it with different kinds of email accounts and servers. It's worked with PGP encrypted mail, with SpamAssassin on the server and more.
It's great. It doesn't change much, which is probably a good thing, Firefox lost me as a user at some point. Thunderbird mostly stays the same, adding features occasionally. As I write this, I realize I'm so used to Thunderbird I'm not even sure what other clients are available. Definitely one of the best programs I've used.
How much money do you currently get? How much money do you need and how will you use it? Does it even go directly to Thunderbird development or will be used up by Mozilla for other projects?
Edit: I found some info here: https://www.thunderbird.net/en-US/donate/
Still, my point stands that communication around it should be super clear and available on all pages where they collect money. It shouldn't require me to search for it.
* https://blog.thunderbird.net/2020/01/thunderbirds-new-home/
Now that I read the comments I find out Mozilla might have enough money and a CEO taking in millions. Any recommendations for a good email client on Linux? Just as a backup for now...
I guess I don't understand why the open-source email client with zero revenue potential is managed by a for-profit subsidiary, nor why that for-profit subsidiary is begging for donations.
Shouldn't this whole thing be managed by the non-profit Mozilla Foundation?
For what it's worth because legal names are confusingly similar, this is a legal subsidiary of Mozilla that is specific to Thunderbird, as in if you give it money it goes straight into Thunderbird. Many people here pretend to wish to be able to give money directly to Firefox, yet when they can do that for Thunderbird, people here are still finding bullshit reasons not to do so. Pick a lane.
Right, I get that, but why is it for-profit? Fund raising is hard enough for nonprofits, convincing people to donate their hard-earned cash to a for-profit is on a whole different level.
(Though of course, employees of either entity can be paid whatever, which also holds for every other non-profit.)
https://blog.thunderbird.net/2020/01/thunderbirds-new-home/
Note that many non-profits have exceptionally high-paid executives and "contractors".
Regulatory requirements on non-profit organizations are very high, and those organizations are, in fact, very limited in what they can do and how they receive their money. There are very good reasons for a non-profit to own for-profit entities, and, similarly, for philanthropic organizations to organize as for-profit entities.
The only change in my workflow is that now, I am also using in parallel a stupid command line tool "vibe coded" in Python to read my emails. It allows me to quickly check my emails out of VS Code in a Claude Code session, a bit like when I was doing my emails directly in Emacs :-)
Of course there is still IMAP, but I hoped for better.
They might have the money, but they don't really seem to want anything to do with the project.
Comparing Firefox to Chromium-based browsers doesn't make much sense since these browsers don't develop their own web engine.
Yet, they decide to waste almost $7 million per year to pay a CEO and God knows what else.
Example 1 that is definitely going through Stripe: Ars Technica.
Example 2 that I don't know what is going through: Asimov's Magazine.
In the race for no friction, they add friction for EU users.
Please don’t assume bad faith when the reality is that you don’t know.
[]->
Wouldn't that be cool? The company would have a list of tasks with a dollar amount next to it.
I for one have been dabbling with a bug in ThunderBird for days now that drives me mad:
I recently created a folder in Thunderbird and called it "archive". No way would I have expected that this will lead me to a bug and will take hours out of my day: There seems to be no way to get rid of this folder anymore.
Things I have tried:
"Keep message archives in" in "Copies and Folders" is disabled. I tried temporarily enabling it, setting it to some other dir and disabling it again, that did not help.
I have disabled it in "subscribe".
I cannot rename it.
There is no "archive" folder in the web interface of my email provider, so if it Thunderbird somehow created it on the server, there seems to be no way to see, let alone delete it again in the web interface.
I tried deleting archive.msf on disk. That makes the folder disappear after the next start, but it is recreated after about a second.
I deleted folderTree.json and folderCache.json, that did not help.
I've seen a few of these sites over the years but I can't remember the name of any RN. Search engines are your friend.
Took me so long to learn that the fix was to switch back to the old Outlook.
In my testing, the local IMAP client implementation quite frequently launches a DoS attack against your IMAP server. It'll send the same query requesting new mail messages in a tight loop, limited by the round-trip latency. But luckily, almost nobody uses IMAP via outlook because its so difficult to set up.
If you go into the "Outlook" menu in the app, there's a "Legacy Outlook" button, which relaunches outlook using a completely different binary. The two outlook implementations have different bugs and all sorts of different behaviour.
Outlook For Mac is free but "legacy outlook" requires a MS365 subscription for some reason.
Outlook is also not to be confused with Microsoft's "Web Outlook" client, available at outlook.live.com. It all seems totally insane.
This is Microsoft we're talking about, right?
Thunderbird had consistently (Windows / Linux) a bad performance for me and feature and UX wise it has always only been okay for me.
Still important that a few FOSS solutions for email exist, though.
Mozilla has really gone off the rails. An organisation who claims to work on behalf of the user and who makes a web browser, actively hijacking the user experience to peddle for a few dollars?
Why the heck is Thunderbird “fully funded by financial contributions from [their] users”? Where do the billions of dollars from Google go? All the stupid doomed side projects which no one asked for nor wants and are abandoned after one year?
They go to the Mozilla Corporation: https://en.wikipedia.org/wiki/Mozilla_Corporation#Finances
The Mozilla Corporation then picks and chooses what it finances within the Mozilla Foundation. Their financial statements don't break down how they spend on software development within the Foundation, it only lists out employee salaries, specific directors' salaries and grants to outsiders... but it would seem Thunderbird doesn't get much if they're out begging.
https://stateof.mozilla.org/pdf/Mozilla%20Fdn%202024%20-%20A...
So, as an example, in 2024, it got:
- $498,218,000 from royalties (e.g. Google)
- $66,396,000 from paid services (e.g Pocket, VPN) and advertisers
- $15,782,000 from donations
And it spent:
- $290,448,000 on programmer salaries
- $163,516,000 on manager salaries
- $36,358,000 on servers, cloud, etc.
- $20,258,000 on consultants (e.g. branding consultants)
- $9,573,000 on travel
- $2,192,000 on grants and fellowships
So overall, it didn't spent that much on the stupid doomed side projects! It spent a lot more on flying managers and marketing consultants to nice soirees.
But the real question, not answered by this financial report, is how much programming labour was spent on Thunderbird, versus other Mozilla projects?
On the bright side, that actually makes me a bit keener about donating to it; donating to the Mozilla Corporation seems entirely pointless given donations make up ~2.5% of their income, and less than 10% of what they spend just on manager salaries, whereas giving it to Thunderbird might actually have a positive impact.
Literally every change that's been made to thunderbird in the last 10+ years has made it worse. Mozilla are doggedly using the same philosophy as they are with firefox: "in what new and exciting ways can we make it more shit?".
There are a bunch of things that I used to do in thunderbird with no problem on much less powerful machines that I can't do today.
For example, since they decided to rewrite their perfectly-functional calendar parsing in a trash language, it now eats 100% of my CPU for ~30mins at a time trying to parse my decades-long, many-many-thousands-of-entries calendar. Then when it finishes it notices that it's been 30 mins since it synchronised my calendar, so it syncs and starts parsing all over again! This effectively locks up the whole of thunderbird, making it totally unusable. This issue has persisted for years. The solution I came up with is "stop using thunderbird for my calendar".
There's a similar fun bug which means it won't sync my contacts anymore either. A feature that I had by about 2010 which my nokia phone could manage, modern thunderbird cannot do.
If you'd like another 20 examples of how it's worse today than it was 10 years ago, just ask, and I'll write up a hundred thousand words or so of vitriol.
It's extremely likely that next time I upgrade my distro I'll be shopping for a new email client. Currently I have thunderbird marked as held so that it doesn't upgrade. When I upgrade my distro there will be a new version of thunderbird, and I'd estimate about a 90% chance that that's when I'll make my exit, after ~20 years or so.
It's sad. Thunderbird used to be a great piece of software.
Don't give mozilla your money.
I myself am pretty spoiled by Protonmail I think, really enjoying that.
[0] https://github.com/GNOME/geary
I switched away from Thunderbird about a year ago and couldn't be happier I have made the change.