Thunderbird Community Forum

I use Thunderbird on multiple computers, sharing an NAS. One is Windows 10, one is Linux Mint. Both have Thunderbird 153.3.1esr installed. The email Profile and email file storage is on the NAS. The "home" folders on both machines have a profile.ini file that points to that shared profile. This worked fine for many years.

For perhaps 6 months i've only accessed email from Windows. Now i'm trying again to access from LinuxMint. It no longer works.

From Linux, at startup, Thunderbird complains that i'm trying to open my profile from "an older version of Thunderbird". A popup dialog claims "A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. " It offers to create a new profile.

First, the same version last edited the profile as is reading it. Second, i don't want to create a new profile, as the existing one has multiple email accounts at multiple domains, with multiple sigatures, and custom storage paths, etc. I tried profile manager, but it just takes me back to this dialog.

How do i get Thunderbird to use my existing shared email storage ?

My emails are not downloading even though it says I have messages and they are downloading it just eventually stops and nothing is downloaded. This has been going on for several days. I made sure that my app is up to date and it is. I shut down the program and restarted my computer this also didn't do anything.

Abbreviations ( Nat'l for National) locks up a send function. A mis-spelled word locks up TBird when I click send. For either instance the mouse will not click on anything except the red X delete.

Hi!

I am on a Windows 11 desktop running Mozilla Thunderbird to the roadrunner account from server mail.twc.com - Spectrum. Thunderbird is set to update automatically.

I have been getting an error message saying that the I am blocked from the server when it checks for new messages every 10 minutes. It sometimes lets emails come through, and other times, they are blocked. Same problem with sending. I cannot send, then wait a few seconds, and it sends okay.

This has been going on for about 3 or 4 weeks.

Thank you for any help you can give!

- ToSt

When I send a message the send box does not close. It remains open and says it is saving the message in the sent folder. I then have to quit thunderbird in order to close the box and get back to using thunderbird again. It does save it in the sent folder. but the box remains open Why is it doing this?

Subject: CompuServe/AOL mail stopped working in Thunderbird 153.3.1esr — Yahoo says “invalid client id”

My CompuServe.com account stopped receiving mail in Thunderbird at approximately 1:15 p.m. Central on September 19, 2026. Thunderbird reports version 153.3.1esr, released September 18. I can still sign in and read the account’s mail through webmail.

When Thunderbird asks me to authorize access, I reach a Yahoo page titled “Review access details.” I check the box agreeing to the OpenID and OAuth terms and click Next. Yahoo then displays: “Uh-oh, looks like something went wrong. Please try again later.” Beneath that, it says: “Developers, please specify a valid client and submit again.”

The resulting URL contains `error=unauthorized_client` and `error_description=invalid+client+id`.

The incoming server’s authentication method is OAuth2. I checked that Thunderbird accepts cookies, and I have fully quit and restarted it several times. I have only one AOL/Yahoo-managed account in Thunderbird. My outgoing SMTP server is through a different provider and has worked in that configuration for years.

Could someone determine whether Thunderbird 153.3.1esr is sending a client ID that Yahoo no longer accepts, or suggest a way to restore incoming access without removing the account? I have not deleted or recreated it because I need to preserve my locally stored mail.

Just got an email from GoDaddy, my domain provider, about Microsoft discontinuing Their Exchange Web Service. My wife uses the web service but I use Thunderbird. Will Thunderbird still work for Exchange email or do I have to submit to Microsoft's extortion and use Office 365?

This is the message I got:

Microsoft will be ending Exchange Web Services (EWS) in the next few months. Your email service is not ending. We're contacting you because your account shows you may be using EWS. If you use a current, supported Microsoft application, keeping it up to date should be the only action you need to take. If you use another email, calendar or backup application, or your organization manages its own connection to Microsoft 365, please review our help article to check whether further action is required.


The deprecation of EWS is currently scheduled to begin in October 2026 and be completed by April 2027.

Hi currently on version 153.3.1esr 64 bit

Bug

Refer to uploaded images for reference.

When creating a "New Event" I select "No reminder" save and close but reminder is still active and icon appears in the calendar next to the event.

I have to then edit the event and change the setting which has somehow changed from my selected choice of no reminder to custom.

Sorry - first post here - hopefully I followed protocol.

Hi,

In my one account in Thunderbird, I still have the old POP folders, that was a different account. I also have an IMAP account, both have the same address. The pop one does not work but the folders are there, I use them to look old mails up, so far so good. When I sent out an email with my IMAP account, the sent mail goes into the sent folder of the IMAP account, so far so good. BUT when I click on that sent mail and click on reply, it replies to the same address that what it already was sent to, now here comes the problem. THAT copy of the mail, I called the NEW sent, does not go into my sent folder. It goes directly into the sent folder of my old pop account. Even though everything on the IMAP account is standard, re-sent mails are not placed in the IMAP account sent folder. What am I doing wrong here, I know when writing the mail is that I can choose the send address and if I change that it goes in the IMAP sent folder but why is it standard on my old POP account, and why not on the IMAP account even though the IMAP is the standard?

При использовании приложения Thunderbird в качестве почтового приложения возникает следующая проблема: Отправленное письмо не сохраняется в папке Sent, при этом письмо уходит получателю. Также письмо и не появляется (не сохраняется) на сервере. Я использую почту yandex, подключена по протоколу imap в соответствии с требованиями, которые они сами указывают в инструкции (Входящая почта Адрес почтового сервера — imap.yandex.ru. Защита соединения — SSL. Порт — 993. Исходящая почта Адрес почтового сервера — smtp.yandex.ru. Защита соединения — SSL. Порт — 465) Проблема наблюдается сразу у нескольких людей.

Thunderbird says "certificate for mail.capsense.com is not valid for that server..." and hangs. Then awakes in 10 minutes.

I've been getting this message for months without problems.

Used old method to setup email accounts and it worked fine. New UI will jam the user name and host name and host name together for new email account setup. In UI for: Username It will have the full user and host together eg. test1@test.com Then during account setup after you enter password, I can see it on the bottom of the UI panel, so like this... test1@test.com@test.com When you go back it will put in the Username field, test1@test.com even when you deleted the host test.com from it. Also the host field screws up. It will put a period in front of the host name eg. .test.com So you have to delete the period.

lors de l'envoi d'un email, j'ai ce message d'erreur : Une erreur est survenue lors de l’envoi de l’e-mail. Le serveur de courrier a répondu : Client host rejected by spamhaus for spamming issues; please refer to Listed by XBL, see https://check.spamhaus.org/query/ip/xx xx xx xx for further information.

sur Thunderbird de mon PC en Win11 je ne retrouve plus les mails que j'envoie alors que j'ai la preuve qu'ils sont bien reçus : à quoi est ce du ? ... sachant que j'ai un indicateur en rouge qui apparait en bas à droite de ma fenêtre générale avec" 98 % utilisé" ??? a quoi cela peut il être du ? merci d'avance pour votre retour Emmanuel

9/21/26

Dear T-bird Community Helpers,

This is my 1st use of any Mozilla mutual help community message board. I'm learning the ropes.

Re. the OS build: I never use beta anything. I established the folder, that went zero on me, recently (less than 2 weeks ago). I hadn't yet backed it up onto the cloud or a flash drive or other medium. Was just about to, but thought I'd rename the folder 1st, 9/13.

My mistake there, but not in the renaming. Never renamed a T-bird folder before. I had set up Thunderbird the week before 9/13, as a backup to e-mails in my Earthlink WebMail Premium account. 1st as a POP account, then later that week, after checking with a reputable AI interface, I made an IMAP.

Today I couldn't find any prior messages in this community board. That I, with my best focus, found relevant to my situation.

I try to learn what is involved, first, in decisions between products, accounts, and methods to follow. But I don't have all day. I don't short-shrift research, but I don't have all day. I relied on an AI bot when I had second thoughts on appropriateness of POP account, and it recommended IMAP account be added. Not substituted for the POP one, though---I asked it about that. too.

I work hard to learn computer terms but am not deeply skilled with computer stuff. I cannot generally read between the lines, to infer what sub-step to take to make the next listed step likelier to work. Nor can I understand very unnecessarily complex instructions, so please be feasibly simple in how you instruct me to find a way to restore my local folder. I don't know the exact name it had before. I use spelling tricks to keep folder names short, so there are MANY possibilities for the old name of that folder.

Your advice, please. I will be grateful for friendly, complete, instructions. Worded simply as is feasible. And questions 1st, sure, if you need to know more 1st.

         Thank You,
             AK

Editorial note - please do not put spaces at the front of each line.

So, I recently updated Thunderbird and I appear to have lost the Spell check as you type feature. By 'doesn't work' I mean; The incorrectly spelled word is underlined, but a right click shows; No Spelling Suggestion (which kind of suggested the feature can't find or isn't reading the dictionary)

I have done multiple things to try to get it to work.

I have checked I have the English Language Pack installed in Add-ons> Language I have check I have an English dictionary installed in Add-ons > Dictionary. (I have uninstalled the above and re-installed them too, including, shutting down Thunderbird in between)

I have unchecked the "Enable spell check as you type" in Settings > Composition, restarted Thunderbird and then re-checked it.

Quite by chance, while I was typing this, I added an Add-on called "Easy Table Editor by Cardella" And whilst testing it, I noticed the Spell Check as you Type worked in the Pop-up window and continued to work inside the inserted table in the compose window. NOTE: Text outside the table, still does NOT work.

Whilst playing around, I also used a Text Highlighter tool (TextMarker) and amazingly, text that has been highlighted, also seems to work with Spell Check as you Type.

I then deleted everything (Ctrl A) Delete. And any text I type, now responds correctly to the Spell Check as you Type.

So, something in the thml code seems to be disrupting the code?

I deleted this line and it works

First, i use Thunderbird 153.3.1 esr (64 bits). My browser is Firefox 156.0 (64 bits) and my Internet service provider is Free (from France).

My issue is I receive an error message (505-5.7.30) when I send a mail to one ou some people. At every time, the error comes from adree finished in ...@gmail.com

This is the end of the error message i receive :

'The mail system

<(hidden identify).54@gmail.com>: host gmail-smtp-in.l.google.com[173.194.76.27] said:

   550-5.7.30 Your email has been blocked because DKIM authentication didn't
   pass 550-5.7.30 for this message. Gmail requires all email bulk senders to
   550-5.7.30 authenticate their email with DKIM. 550-5.7.30  550-5.7.30
   Authentication results: 550-5.7.30  DKIM = did not pass 550-5.7.30  To set
   up DKIM for your sending domains, visit 550-5.7.30
   https://support.google.com/a?p=turn-on-dkim  550-5.7.30 To learn more about
   Gmail requirements for bulk senders, visit 550 5.7.30
   https://support.google.com/a?p=sender-guidelines.
   ffacd0b85a97d-487245a57a8si2910364f8f.321 - gsmtp (in reply to end of DATA
   command)

" I have need a translator to read and understand all of that... But when I go on Google support to have the way to solve my problem, the explanations are too complicated for me !

Lionel Grosselin