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've been using Thunderbird for decades, I've donated in the past, and am likely to donate again. With that out of the way, the lack of transparency as to what happens to my money kills the incentive to donate.
"How will my gift be used?"
"Thunderbird is the leading open source email and productivity app that is free for business and personal use. Your gift helps ensure it stays that way, and supports ongoing development."
Well that tells me exactly nothing. This might not be as big an issue if they were separate from Mozilla. To be concrete, and focusing only on the development of Firefox, there's now an AI chatbot in the sidebar. I think that's a good addition. However, when the only options are proprietary services, it's hard for me to see the point of Firefox. It would be easier to get out my credit card for Thunderbird if I didn't have those thoughts in the back of my mind. As it stands, my donation might be going to fund the Mozilla CEO's salary.
I find that a weird sentiment. Why do people demand to know and control how every one of their donations goes, while nobody questions how corporations use their money. Ironically, the demand for this increased transparency significantly increases compliance cost, which means more and more money is driven away from the actual cause toward the administrative costs. Exactly what people don't want to support.
The defining difference about paying money to a corporation in exchange for a product is you're paying for something already there, an agreed exchange of value. The whole point about a donation is it's given not in exchange for doing any particular task, but gratuitously.
It's not a weird sentiment to want to know what benefits a gift is providing. That's all people are asking for when they want transparency around donations: tell us how you're benefiting from it so we can feel good about gifting you.
Is it necessary? No. The point being made is that people would be happier and potentially gift more if there was more transparency. If your argument is transparency costs more than the extra gifts then the solution to that is - ironically - be transparent about it and people might gift means to make transparency cheaper and make donations viable.
When you're shopping for a paid product, you're generally trying to minimize your costs (while balancing quality). When you're donating to a free product, you're actually trying to maximize the effectiveness of your donation. If you were simply trying to minimize your cost/benefit ratio, you would donate nothing. Clearly there is a totally different mentality at play.
Consider it also from the recipient's perspective. Their benefactors are more likely to donate more money when they believe it will be put to good use. It's a complicated messaging problem, but being vague is probably not in your best interest.
The reason "nobody questions how corporations use their money" is that in 99.9% of cases when I pay a corporation money for a product, I'm doing it not for the sake of what they can do with the money, but because otherwise I don't get to use the product, at least not legally.
If instead I donate to an open-source project, I'm not doing it in order to get access to the product; I already have that. I'm doing it because I hope they will do something with the money that I value. (Possible examples: Developing new features I like. Rewarding people who already developed features I liked. Activism for causes I approve of. Continuing to provide something that benefits everyone and not just me.)
And so I care a lot what they're going to do with the money, in a way I don't if I (say) pay money to Microsoft in exchange for the right to use Microsoft Office. Because what they're going to do with the money determines what point there is in my giving it.
Sometimes, everything the project does is stuff I think is valuable (for me or for the world). In that case I don't need to ask exactly what they're doing. Sometimes, it's obvious that what happens to the money is that it goes into the developer's pockets and they get to do what they like with it. In that case, I'll donate if the point of my donation is to reward someone who is doing something I'm glad they're doing, and probably not otherwise.
In the case of Thunderbird, it's maybe not so obvious. Probably the money will go toward implementing Thunderbird features and bug fixes, but looking at the history of Firefox I might worry that that's going to mean "AI integrations that actual users mostly don't want" or "implementing advertising to help raise funds", and I might have a variety of attitudes to those things. Or it might go toward some sort of internet activism, and again I might have a variety of attitudes to that depending on exactly what they're agitating for. Or maybe I might worry that the money will mostly end up helping to pay the salary of the CEO of Mozilla. (I don't think that's actually possible, but I can imagine situations where Mozilla wants some things done, and if they can pay for them via donations rather than using the company's money they'll do so, so that the net effect of donating is simply to increase Mozilla's profits.)
And I don't think anyone's asking for anything very burdensome in the way of transparency. Just more than, well, nothing at all which is what we have at the moment. The text on the actual page says literally nothing beyond "help keep Thunderbird alive". The FAQ says "Thunderbird is the leading open source email and productivity app that is free for business and personal use. Your gift helps ensure it stays that way, and supports ongoing development." which tells us almost nothing. And "MZLA Technologies Corporation is a wholly owned for-profit subsidiary of the Mozilla Foundation and the home of Thunderbird." which tells us that donations go to a for-profit subsidiary of the Mozilla Foundation (which I believe is the same entity that owns the Mozilla Corporation, but like most people I am not an expert on this stuff and don't know what that means in practice about how the Mozilla Foundation, the Mozilla Corporation and MZLA Technologies Corporation actually work together).
Maybe donated money will lead to MZLA Technologies Corporation hiring more developers or paying existing developers more? Maybe it'll be used to buy equipment, or licences for patented stuff? Maybe it'll be used to advertise Thunderbird and get it more users? Maybe it'll be used to agitate for the use of open email standards or something like that? Maybe. Maybe some other thing entirely. There's no way to get any inkling.
Mozilla and Wikipedia for example are causes I support. But why would I give money to them if they are going to turn around and give money to some cause I don't support (OR am actively against)? These non-profits love to shuffle money around to unrelated causes. As a non profit, supporting open source software, I think expecting a large percentage of the donation to go to engineering and not admin, social causes, etc. is a reasonable expectation.
When the product is in dire state but the company does unnecessary things and increase CEO salary YoY with ever declining userbase, yes... Maybe the people who donates want to know. Am talking about Firefox there BTW. So it's absolutely understandable that people want to know.
Investors do very much question how corporations use their money, and that is why corporations publish quarterly financial statements and have shareholder meetings and hire accountants and auditors. Investors want to make sure that they're going to get their investment back plus profit and thus care about a company's balance sheet. Any financial transparency in non-profit donations is derived from the financial transparency required by for-profit investments.
When making purchasing decisions lots of people look beyond the utility of the product to the broader behaviour of the corporation and how it impacts society. I know people who've been avoiding Nestlé for decades.
When I pay money to buy food I don't need to ask how the shop is going to use that money: I gave money, I got food.
If I am going to donate money to a company/NGO that wants to buy food for poor people, of course I am interested in knowing how much of that money is going to salaries, how much into activities of sort, and how much in actually feeding people.
> Ironically, the demand for this increased transparency significantly increases compliance cost, which means more and more money is driven away from the actual cause toward the administrative costs.
I disagree.
If you are asking people for donations, then it is only fair that you provide transparency.
Donations are made out of pure goodwill. It is not like buying a widget from $megacorp.
I do not buy the "increased administrative costs" argument either. At a bare minimum all it would take is 5 minutes a month and a simple spreadsheet.
Well for one, when you purchase something from a corporation, you know where the money went because you got the thing or access to the service you just paid for. With a donation you don't have that and because you're donating you probably care about whatever subject you want to improve so you'd like to know that is were your money is going instead of finding out later it just went to the CEO of whatever to blow on blackjack and hookers.
In the case of Mozilla, you actually know donating to the Mozilla Foundation does not in any way benefit Firefox or Thunderbird, which is probably the whole reason you were actually donating in the first place. Donating to the Mozilla Foundation funds all the pointless side projects they they decide to pick up and pay the CEO quite frankly an undeservedly large salary.
Exactly what I've been saying when people complain about how public sector spends the taxes (especially when comparing against private sector so-called efficiency when managing hospitals or schools)
I have the same beef with the Signal Foundation. A few years ago, I engaged with the new CEO when she was soliciting donations and asked whether they were going to publish any kind of high-level feature roadmap. I explained that there were a few features I was really looking forward to, and that I’d even written some code that might help expedite them getting rolled in. She told me that stuff like publishing roadmaps takes time and resources they don’t have.
I mean, as I've somewhat said above, I do donate to Mozilla for a direct-but-big reason. Overall, I find their work VERY important. I acknowledge that they've never been perfect, but I've watched what they've done for 20-30 years and strongly trust that generally, they're doing good things with my money because that's what they've been doing.
Thunderbird, separate from Mozilla, I don't think has that to rely on. That does feel more like "why should I give money to this project that (for me) has been pretty mid at maintaining a popular piece of software?"
CEO of MZLA (the Mozilla entity that develops Thunderbird). One point of clarification, we don't get money from any source but our donors. After years of funding issues, MZLA was created by the Mozilla Foundation and the Thunderbird Council (our community governance body), to provide a legal/financial home for Thunderbird.
Launching Thundermail this year (an email service) which we hope to help provide even more funds for development, beyond just donations. Also serving a user need (lots of our users ask us to help them get off Gmail).
Lots of interest in how the money is spent - answer: mostly on devs, landed Exchange support recently (big for a lot of MS users), working on Graph support as well, JMAP after that. Updating the calendar (primarily UX/UI there), continuing to improve our Android app, working on a native iOS app and the aforementioned Thundermail service.
We publish yearly reports and will publish one again this year detailing all this.
Happy to answer questions and we are an open source project so feel free to reach out to us and engage if you really want to see how the sausage is made!
*Edit: More context on what Thunderbird Council is*
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.
> 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 wish Thunderbird fix their plain text editor (it is at level of old Notepad, and chrome for it looks ugly, and line wrapping is a mess, especially with in-line quotation), add ability to store Folder properties (including Identity used for this folder, retention period and such) as IMAP properties and not locally to have same settings on different devices.
And, yes, proper support for Sieve, including per-folder Sieve. Sieve is a pain after they changed something and 3rd party Sieve plugin died (become Electorn Application).
Now Thunderbird has so many rough edges (I named only my top-3, but I'm sure anybody can add others!), but still one and only usable cross-platform e-mail client.
Oh, yes, development pace is unbearable slow: after killing "Manually sort folders" plugin it takes more than year (!) to add this as "core" feature with huge help from aforementioned plugun's author. Very slow process of review, integrating, releasing which takes MONTHS to integrate ready feature. It should be very discouraging for contributors.
Thunderbird now provide like 10% of features of old and almost forgotten (but still alive) windows-only client "The Bat!" from end of 1990s, beginning of 2000s and was written by team of like 5 people.
I thought you were owned by Mozilla? A corporation that has over half a billion dollars in yearly revenue? If they decided to allocate zero funding to you, wouldn't it be vastly more effective to start some sort of campaign/movement (either internal or external) to get that funding back, or to entirely fork and leave Mozilla to be your own independent project, than to ask for random donations?
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...
I installed Thunderbird for the first time in a couple of decades recently. My impression was that it's very feature rich but also quite ugly and not friendly to new users. It comes with a lot of assumptions about what the user wants to do and how, and I found myself having to use cheats and workarounds from the outset. I wanted to import a batch of disparate .eml files that had been seperately exported, and after 15 minutes I was starting to think it might have been easier to just do it in Python.
I also didn't care for the tabbed panels, which make it feel as if the entire thing was just ported from a browser. It really needs some fresh design and user interface work.
392 comments
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.
"How will my gift be used?"
"Thunderbird is the leading open source email and productivity app that is free for business and personal use. Your gift helps ensure it stays that way, and supports ongoing development."
Well that tells me exactly nothing. This might not be as big an issue if they were separate from Mozilla. To be concrete, and focusing only on the development of Firefox, there's now an AI chatbot in the sidebar. I think that's a good addition. However, when the only options are proprietary services, it's hard for me to see the point of Firefox. It would be easier to get out my credit card for Thunderbird if I didn't have those thoughts in the back of my mind. As it stands, my donation might be going to fund the Mozilla CEO's salary.
It's not a weird sentiment to want to know what benefits a gift is providing. That's all people are asking for when they want transparency around donations: tell us how you're benefiting from it so we can feel good about gifting you.
Is it necessary? No. The point being made is that people would be happier and potentially gift more if there was more transparency. If your argument is transparency costs more than the extra gifts then the solution to that is - ironically - be transparent about it and people might gift means to make transparency cheaper and make donations viable.
Consider it also from the recipient's perspective. Their benefactors are more likely to donate more money when they believe it will be put to good use. It's a complicated messaging problem, but being vague is probably not in your best interest.
It also isn't that unusual for donations to be ring fenced for certain things.
If instead I donate to an open-source project, I'm not doing it in order to get access to the product; I already have that. I'm doing it because I hope they will do something with the money that I value. (Possible examples: Developing new features I like. Rewarding people who already developed features I liked. Activism for causes I approve of. Continuing to provide something that benefits everyone and not just me.)
And so I care a lot what they're going to do with the money, in a way I don't if I (say) pay money to Microsoft in exchange for the right to use Microsoft Office. Because what they're going to do with the money determines what point there is in my giving it.
Sometimes, everything the project does is stuff I think is valuable (for me or for the world). In that case I don't need to ask exactly what they're doing. Sometimes, it's obvious that what happens to the money is that it goes into the developer's pockets and they get to do what they like with it. In that case, I'll donate if the point of my donation is to reward someone who is doing something I'm glad they're doing, and probably not otherwise.
In the case of Thunderbird, it's maybe not so obvious. Probably the money will go toward implementing Thunderbird features and bug fixes, but looking at the history of Firefox I might worry that that's going to mean "AI integrations that actual users mostly don't want" or "implementing advertising to help raise funds", and I might have a variety of attitudes to those things. Or it might go toward some sort of internet activism, and again I might have a variety of attitudes to that depending on exactly what they're agitating for. Or maybe I might worry that the money will mostly end up helping to pay the salary of the CEO of Mozilla. (I don't think that's actually possible, but I can imagine situations where Mozilla wants some things done, and if they can pay for them via donations rather than using the company's money they'll do so, so that the net effect of donating is simply to increase Mozilla's profits.)
And I don't think anyone's asking for anything very burdensome in the way of transparency. Just more than, well, nothing at all which is what we have at the moment. The text on the actual page says literally nothing beyond "help keep Thunderbird alive". The FAQ says "Thunderbird is the leading open source email and productivity app that is free for business and personal use. Your gift helps ensure it stays that way, and supports ongoing development." which tells us almost nothing. And "MZLA Technologies Corporation is a wholly owned for-profit subsidiary of the Mozilla Foundation and the home of Thunderbird." which tells us that donations go to a for-profit subsidiary of the Mozilla Foundation (which I believe is the same entity that owns the Mozilla Corporation, but like most people I am not an expert on this stuff and don't know what that means in practice about how the Mozilla Foundation, the Mozilla Corporation and MZLA Technologies Corporation actually work together).
Maybe donated money will lead to MZLA Technologies Corporation hiring more developers or paying existing developers more? Maybe it'll be used to buy equipment, or licences for patented stuff? Maybe it'll be used to advertise Thunderbird and get it more users? Maybe it'll be used to agitate for the use of open email standards or something like that? Maybe. Maybe some other thing entirely. There's no way to get any inkling.
If I donate, I want more devs getting paid, not a CEO parasiting the non-profit.
If you're asking for donations and holding your cap out, the implication is that every penny will go toward development.
Mozilla should either just make it a product that you have to pay for, or sub to, or keep donations cleanly separated.
If I am going to donate money to a company/NGO that wants to buy food for poor people, of course I am interested in knowing how much of that money is going to salaries, how much into activities of sort, and how much in actually feeding people.
> Ironically, the demand for this increased transparency significantly increases compliance cost, which means more and more money is driven away from the actual cause toward the administrative costs.
I disagree.
If you are asking people for donations, then it is only fair that you provide transparency.
Donations are made out of pure goodwill. It is not like buying a widget from $megacorp.
I do not buy the "increased administrative costs" argument either. At a bare minimum all it would take is 5 minutes a month and a simple spreadsheet.
In the case of Mozilla, you actually know donating to the Mozilla Foundation does not in any way benefit Firefox or Thunderbird, which is probably the whole reason you were actually donating in the first place. Donating to the Mozilla Foundation funds all the pointless side projects they they decide to pick up and pay the CEO quite frankly an undeservedly large salary.
https://blog.thunderbird.net/2025/10/state-of-the-bird-2024-...
https://x.com/Cowmix/status/1597636735688900608
Gah!
> Your gift helps ensure it stays that way
Written this way, it sounds like "donate or we'll have to make you pay for it"
Thunderbird, separate from Mozilla, I don't think has that to rely on. That does feel more like "why should I give money to this project that (for me) has been pretty mid at maintaining a popular piece of software?"
Launching Thundermail this year (an email service) which we hope to help provide even more funds for development, beyond just donations. Also serving a user need (lots of our users ask us to help them get off Gmail).
Lots of interest in how the money is spent - answer: mostly on devs, landed Exchange support recently (big for a lot of MS users), working on Graph support as well, JMAP after that. Updating the calendar (primarily UX/UI there), continuing to improve our Android app, working on a native iOS app and the aforementioned Thundermail service.
We publish yearly reports and will publish one again this year detailing all this.
Here is a 2025 recap: https://blog.thunderbird.net/2025/12/thunderbird-2025-review...
But the blog has a ton of updates across the different efforts: https://blog.thunderbird.net
Happy to answer questions and we are an open source project so feel free to reach out to us and engage if you really want to see how the sausage is made!
*Edit: More context on what Thunderbird Council is*
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.
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?
> 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?
And, yes, proper support for Sieve, including per-folder Sieve. Sieve is a pain after they changed something and 3rd party Sieve plugin died (become Electorn Application).
Now Thunderbird has so many rough edges (I named only my top-3, but I'm sure anybody can add others!), but still one and only usable cross-platform e-mail client.
Oh, yes, development pace is unbearable slow: after killing "Manually sort folders" plugin it takes more than year (!) to add this as "core" feature with huge help from aforementioned plugun's author. Very slow process of review, integrating, releasing which takes MONTHS to integrate ready feature. It should be very discouraging for contributors.
Thunderbird now provide like 10% of features of old and almost forgotten (but still alive) windows-only client "The Bat!" from end of 1990s, beginning of 2000s and was written by team of like 5 people.
But still, I've donated!
> We don’t have corporate funding
I thought you were owned by Mozilla? A corporation that has over half a billion dollars in yearly revenue? If they decided to allocate zero funding to you, wouldn't it be vastly more effective to start some sort of campaign/movement (either internal or external) to get that funding back, or to entirely fork and leave Mozilla to be your own independent project, than to ask for random donations?
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 also didn't care for the tabbed panels, which make it feel as if the entire thing was just ported from a browser. It really needs some fresh design and user interface work.