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I was sending emails just fine last night, I can send them fine from the web browser, and I can do it fine from mail app on my phone. But when I try to send it from Thunderbird, I get an ongoing error with the following:

Login to server smtp.office365.com with user name my email address failed.

I have already checked the settings, and I changed and re-entered the new password in Thunderbird, and while I can still receive emails I cannot send them.

Here's an exact image of the settings I put, minus my blacked out email address.

I've tried two different email addresses to send to, including a test email to my own address, so I'm at a loss what to do. Have also closed, and restarted Thunderbird, and my whole PC.

I am receiving emails just fine, and I changed nothing before this error started, I double checked everything, even my email address, and copied my outgoing email address name to my online mailbox and sent myself a test email just to be 100% certain it's correct.

Hi, Updating Ubuntu 24.03 to 23.10 something went wrong and the disk is no longer bootable. All the files appear to be there, but since its not bootable I can't export the data in the normal fashion.

I installed Ubuntu 24.04.3 LTS on a new disk, and mounted the unbootable disk on /oldDisk. My home directory and everything else appears to be intact.

What do I need to move from /oldDisk to the new install to get my address book and emails back?

until I get this fixed you can email me: <redacted>@evvette.net as my account address won't work... thanx in advance, Steve

Since eclipse 140+ rolled out there is no longer a high contrast colour override, I dug through all the settings in case it was moved but I am either not seeing it or it's not there anymore. Does anyone have an option or work around for enabling high contrast without me having to roll back my version or install a different email client?

I've been using Thunderbird for year on my desktop. Just got a new one and I can't get Thunderbird to start. I have NO IDEA what the "set-up" wants from me. The most recent error is "Authentication FAiled. Please check the username and password."

I JUST reset the password. What does Tbird think my user name is if it's not my name???? And why doesn't it give me an option to find out what it has stored somewhere for me??

I have Thunderbird on 2 computers and both can receive emails but not send them. One is brand new. When I send an email I am asked for my password for my outlook account but when I send it I get the message that authentication did not occur. Any ideas?

My friend was unable to configure his outlook.com email address in Thunderbird (143.0.1) while I had no problem doing so in mine (140.3.0esr). We both had installed other email addresses already configured with no problem. I upgraded my second laptop from the esr version to his recommended release version, and hey presto, I suffered the same fate. This is definitely a bug within Thunderbird 143.0.1 which is the current release version.

I had not previously added the outlook email to Tbird as it is not my main email address.

More info: The error message encountered was:

Authentication failed: Please check the username and password

When you click on the "More information" link, it says:

"Exchange auth error"

Please note that we checked the username and password and verified them as correct. I addition, I was successful using that username/password on the 140 esr version and it worked perfectly.

Within the TB desktop app the local folders alphabetically below "C", including sub-folders within a folder "Credit Card Processors" have disappeared. The drop down Folder Pane has cutoff. I see in my Profile the missing folder icons with .sbd extensions and files that duplicate the folder names, one with no extension and one with .msf extension. I've tried uninstalling and reinstalling, and other "fixes" I found online. I'm using Owl for Exchange so my storage folders are on my desktop and also backed up on a separate drive. Additionally, there was an update at 10:05am this morning and it seems like this may be more than a coincidence. I'm on Windows 11 machine, version 143.0.1 (64-bit). Thank you.

Hello, I want to convert my POP account to an IMAP account. I am following the procedure for creating a new email account. I enter the account name, email address, and password. But at the end, I always get the following message: Authentication error. Unable to connect to the server. The configuration, username, or password are probably incorrect.

Please note that I am using the same name, email address, and password as for my POP account, as recommended in the online help.

Best regards Dominique Chevalier

For several months, I think, Thunderbird on my PC was failing to receive any of my emails that people, including myself, sent to my mailfence.com email address. The emails to my mailfence.com email address came into my *iphone* just fine; just not into Thunderbird, which is on my PC. They used to come in fine into my PC's Thunderbird app for the last few years.

Turns out, I THINK, the culprit was that I had *thought* I was clicking the old "Get Messages" button, but that button WASN'T EVEN AT THAT SPOT anymore! Instead, I was mistakenly clicking the "Mail" icon, thinking it was the "Get Messages" icon, or at least that it was serving the same purpose as the old Get Messages icon used to give me.

Somehow I just now saw a bunch of emails to my mailfence.com email address come into Thunderbird, from my recent various experiments. Not sure how I did that; maybe clicking the "Mail" icon does in fact serve as a "Get Messages" icon?

Get a load of the attached screengrab, and you'll see my confusion: (1) There is no longer a "Get Messages" button at the upper left. (2) AND, there's no File Edit View bar of tabs at the very top like there used to be! The File Home View you see in this screengrab is from the PAINT app, I believe. I realized this problem by looking up in Thunderbird Support how to get "Get Messages" back and saw a screengrab that had File Edit View, that I then realized I was missing.

Thanks for any help getting me back my File Edit View and my Get Messages button. If you see other problems in this figure please I'd appreciate your letting me know how to fix that, too!

When moving a task from "meine Aufgaben" (my tasks) to another Gmail calendar tasklist ("AI"), a ghost entry, which cannot be completed or deleted, remains in the old Thunderbird tasklist "meine Aufgaben". Thus I have many tasks twice in different Thunderbird-calendars, but only once in Gmail.

I got this answer to my problem:

The Send bar has disappeared KAMI 30 sep. 2025 19:35:12 Hi, to customize the toolbar in Thunderbird: Right-click on an empty space next to the Search bar in the toolbar. Select Customize… (Toolbar) from the context menu. A window will appear showing all available buttons and the current toolbar layout. You can drag and drop buttons to add, remove, or rearrange them. When you’re done, click Done to save your changes. This is the quickest way to restore missing buttons like Send, Attach, or any other tools you use frequently.

Unfortunately, the bottons like Send and Attach are not available here in my application!

Been using Thunderbird for years with these accounts. Just today outlook accounts failing to login. Accounts do not receive email. Can not send email. Checked server settings, which were unchanged and obviously worked previously. Tried deleting passwords in password manager and re-entry. Failed. What's up with the outlook connnection?

Each time I start TB, I get this message: "The folder 'Inbox on MilusC@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

Good day, I have received your reply to my problem of missing files in my local folders after upgrading to T-Bird 143.0.1 Your reply is a “No reply” message so I have to start all over again with this new message to go forward. Here is what your reply said: re: I noticed that a large part of one of my local folders is missing.

I presume by local folders you are talking about the 'Local Folders' special account. So, if different you need to clarify.

YOUR REPLY: Please post/upload an image of the 'Folder Pane' which shows everything in 'Local Folders' account. Then post/upload images that show what is in the profile folder: Assuming you are using Windows OS

   In search type: %Appdata%
   select the %Appdata% file folder
   Select 'Roaming' folder
   Select 'Thunderbird' folder
   Select 'Profiles' folder
   Select name of profile folder
   Select 'Mail' folder
   Select 'Local Folders' folder 

Make sure the view is showing all contents in column details format, extensions and hidden files must be allowed. Make window large enough to show all contents - or if necessary, post more than one image. This means I can compare profile with Folder Pane and check to see if appropriate files are missing. What Anti-Virus do you use? Is it allowed to scan your Thunderbird profile folders? Do you use any Anti-Virus or other cleanup program like CCleaner or Wisecleaner that cleans up temp files etc? If yes, then what do you use?

MY REPLY First, your instructions do not work because following your path, I go down each line until I reach (Select Profiles folder) Once opened it gives me the names of my 2 alpha numerical profiles and I opened each profile there is no such thing as "Local Profile" folder. The View shows all files, My AV is Bitdefender; I have no clean up software My system is w10 pro x64 I have been using T-Bird for years and installed dozens of updates always using my same system and tools so something seems to be wrong with the update itself. I will wait for your reply Thank you for your support Best Regards Douglas Noades

one email I regularly receive from same sender never displays properly. I have enclosed pictures of what I see in Thunderbird [143.0.1 (64-bit)] windows 11 [24h2] and what it should/does look like on web at gmail.