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Get this error message I think since the update on September 2nd. See below

Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox. Also, I downloads a few old emails from September 2. If I delete them, they re-download when I click on get mail. I do get mail on my phone and on the Xfinity web site. I really would like to get this fixed as soon as I can. Thanks, William Dudzinski - <redacted>@comcast.net - <redacted>

I have installed Thunderbird with Zorin 18 and it won't show contacts. Google says that Thunderbird has full access to contacts. Attempt to manually add contacts fails with message of "Can't connect to server". I did have to manually add the calendar to make that part work. Is this an uninstall and reinstall (Thunderbird that is) situation?

Thanks for your help

Ken

Hi, In profiles, I have several, many of which are up to date and 2 are large, one which is meant to be my current profile at about 2.5 Gb and another at 3.6 Gb (plus others of about 50 Mb) - see screenshot. What is going on?

I have followed the directions at https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer#thunderbird:mac:tb146 several times but only one acct is transferred and NO local folders. I am going from Thunderbird 146.0.1 on a Windows 11 PC to a Mac Mini M4 running Sequoia 15.3.1

Help

I am just burned out with Firefox and not sure why I should continue to use it instead of some fork or Chromium-based browser.

It seems like every update brings some new GenAI/LLM component that is auto-enabled and difficult to disable. I do not want GenAI/LLMs in my web browser. I have dropped nearly every other application or software that has forced it on me and included it in their product. I feel like I'm trying manage a Windows system having to follow blogs to debloat, restore privacy, and restore security. GenAI/LLMs shouldn't be in my web browser. And, they should be opt-in, not opt-out in some confusing mix of GUI and about:config madness. If GenAI/LLM is so great, then make it an extension or a fork then let those folks use it from there. Don't bake it into the web browser.

I continue to use Firefox for uBlock Origin but I guess that would be possible with a Firefox-fork. However, I am just tired of having to continuously manage my Firefox browser and battle websites that only support Chromium-based browsers. If Firefox actually seemed intent on improving security and privacy then I could find the motivation but this GenAI/LLM nonsense seems the point of no return.

On my Android phone, I've switched to a Chromium-based browser given the poor state of security and hardening for the vanilla Firefox. I keep IronFox on hand but it is just easier to surf the web with a Chromium-based browser due to many websites just working better. Why should I deal with the pain and frustration of limited Firefox support when Firefox isn't even keeping up with security hardening?

As for desktop, the Firefox browser just doesn't seem as snappy or stable as I would expect. Firefox for Linux is still not supported for Slack Huddles. How is it 2026 and Mozilla/Firefox are still not fully functional with one of the major business chat platforms? Yes, I know this primarily a Slack and AWS-Chime-SDK problem but it is also a Firefox problem because there isn't much that a user can do. I've tried to prod Slack and the AWS teams numerous times to support Firefox but they've just done nothing. I also see nothing being done by the Firefox team, too.

Another example is the EdgeSuite CDN. Nearly always they block my traffic when I use Firefox. Switch to a Chromium-based browser and EdgeSuite is much less likely to block me. This is fairly consistent for the retail and financial institutions I use.

As far as I am aware, many of the security concerns brought up by Madaidan in 2022 still hold true for Firefox today, especially for Android and Linux. If this is no longer true, then it might be good for the Firefox team to post a rebuttal or update clarifying the current state of Firefox. The average users such as myself only see the Madaidan blog post and have to take it at face value. https://madaidans-insecurities.github.io/firefox-chromium.html

Anyway, I don't see a way ahead for me and Firefox but maybe you can convince me. It just seems like Firefox and Mozilla have lost their way. They no longer seem focused on security and privacy. Instead they're forcing privacy, security, and system resource disasters onto their userbases, just like Microsoft, Google, and every one of the major tech firms. I just don't see why I should use, promote, and even support Firefox going into 2026.

After many years of using Thunderbird with an AOL account I changed my password in AOL to increase the security. So I had to install the AOL account again in Thunderbird. I created an app password in AOL and put it in Thunderbird. Everythin fine so far. AOL login window opens automatically. But after login to AOL the message "somthing went wrong" and "try on anther device" pops up. I tried it on several PC's - no way. Other mail clients like Mailspring oder Mailbird did work with the AOL account. What is the problem?

Each time I start TB, I get this message: "The folder 'Inbox on redacted@aol.com' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again." What does this mean and what can I do to fix it. Thanks. M. Campbell

I am getting the following error message in Thunderbird. Unable to download email to mailbox. Please make sure that the file system has write permissions and that there is enough disk space to copy the mailbox. Write permissions are available and there are 735 GB free.

I get a message trying to access my account: Kunne ikke skrive mailen i mailmappen. Sørg for at du har skriverettigheder til filsystemet, og at du har nok diskplads til at kopiere mailmappen. This is in danish so I hope You understand. But how to solve this issue? I can not receive mails because of this. Best regards Poul Kristiansen

Dear Sir or Madam,

I have lost all stored folders with my email correspondence from the Local Folders for an unknown reason (I restarted my computer, and they disappeared). I can find some of these emails using the search option, but I cannot see the path of their storage location. I have checked my Profile/Mail/Local Folders, but they are not there. Are they stored on the server? How can I recover these folders?

Thank you very much in advance,

Jasmina

an year ago on 11/25/24, I have raised this same issue https://support.mozilla.org/en-US/questions/1475852#question-reply Another user https://support.mozilla.org/en-US/user/davidsk/ replied that it is a bug ! I still have the same problem !!

My hard disk is again almost full. And it is primarily Thunderbird bloated folders.

In the MAC hard-disk, size of the many of the folders stored in local directory, are much larger that the size on TB.

For reference, On TB, "_cc folder" is 2.0 GB On Mac Finder, "_cc folder" is 13.63 GB

I have right-click the folder and press "compact". The folder on TB reduces in size. But, the folder on the Mac harddrive does not reduce in size.

Thunderbird 115.4.1 (64-bit) on macOS 26.1 Server Type : POP Mail Server

Appreciate help to get this fixed.

Thanks Attached screenshots

My Thunderbird inbox stopped accepting messages with a message 'Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.' I 'repaired' the folder but all my junk messages suddenly reappeared in my inbox (a lot of them!). Tools didn;t work (wanted to re-apply junk filter). Went into safe mode - no difference. Now can't get any tools to work on the inbox folder. Not sure what to try next. Help much appreciated.

When I try to send a new e-mail the address list which appeard on the left of the screen has now vanished and I am unable to Bcc several contacts with the same massage. Can someone tell me please how to get the list back on the screen when I select 'New Message' Thank you Bernard Solca

When I receive a newsletter from my club, it doesn't show the pictures. It does describe the picture and warns it might be AI generated. If I reply to the email or forward it, the pictures are displayed. I suspect this might be a settings problem. The original email includes:

[image: A picnic table and benches on a stone surface AI-generated content may be incorrect.] [image: A group of people dancing in a room with lights AI-generated content may be incorrect.]

[image: A person and person standing next to a vase AI-generated content

may be incorrect.] [image: A person sitting at a table with food on it AI-generated content may be incorrect.] [image: A group of people sitting at a table with plates of food AI-generated content may be incorrect.]

[image: A group of people dancing in a room with lights AI-generated content may be incorrect.] [image: A group of women posing for a photo AI-generated content may be incorrect.] [image: A group of people standing in a room with lights AI-generated content may be incorrect.]

Can anyone shed some light on this?

I have 2 hotmail accounts that Thunderbird can access but my wife's one has not since set up.

I have had to set up new email account for my wife because her one she has used for 10 years will end after 6th January 2026 because email service provider is ceasing email business. I have an hotmail address that has worked seamlessly with Thunderbird for 10 years. If it is tried in Thunderbird to access the new account to check for new mail it either states not authorised or not connected. I have tried adjusting settings to be same as mine but not succeed in solving. I am at a loss. Maybe it was easier set up accounts 10 years ago?