Thunderbird Community Forum

I am currently unable to send emails. I am getting a error message saying: Connection refused - OB116. 159.196.15.181 is blacklisted in Abusix Mail Intelligence. I can receive emails but not send them.

Sometimes when I go to my inbox it says "no new messages", when I have several hundred. and sometimes in the Send Folder too. I have to click on "All Mail" to see them. Does this happen to anyone else? What can I do to change this?

I use emojis in email, but recipients report that the text of the email arrives covered with emojis. I thought it was a problem with the receiver until a second person just reported the same issue with an email I sent them. Both are gmail accounts . . .

My email used to put all my new emails at the top of the inbox. But recently it has started putting them in between the emails already in my inbox. How can I get my inbox to load my new emails at the top of the inbox?

Is there a way to revert back from a Thunderbird update? I have my inbox with current emails, but my folder organization on the left is disorganized and contents are missing and many folders are missing. It's destroyed YEARS of work!

Trying to set up new Gmail account in Thunderbird. New account dialog opens, recognises Gmail address and imap details, but doesn't allow me to provide Gmail with password. Authentification failure results.

I have read the topic "Microsoft EWS to Graph Migration October 2026". I have followed the instructions meticulously MULTIPLE TIMES. Unfortunately for me, it DOES NOT WORK!! After deleting the EWS account, I proceed to create the new Graph account, but it fails (has failed) EACH AND EVERY TIME I've tried it. I finally had to give up, and restore/re-install/setup the Thunderbird EWS version. The failure reported on each failure was an "authentication failure".

My OS is macOS Tahoe 26.7.1; My Thunderbird version is 158.0. This is distressing! If there is an issue, I would expect T'bird to belay the update until the issues were fixed. If there is a "trick" required, I would appreciate someone sharing it with me. I'm aware that the causes of these issues is "Microsoft Incompetence", but AFAIK incompetence is not "contagious" - I don't understand T'bird/Mozilla releasing a fix with detailed procedures without testing.

EDIT: One other piece of information that may or may not be useful. The article "Microsoft EWS to Graph Migration October 2026" mentions a "Microsoft 365/Exchange Online email account". My account is an "Exchange Server" account; the Exchange server is hosted by Microsoft.

Thanks for any advice.

Best Regards, ~JM

T'bird 153.5.0 esr on Windows 11 25H2.

Main Inbox folder (using POP3) is about 13 GB

Thunderbird crashes and/or becomes unresponsive on opening. This happens in both normal mode and safe mode.

Typically, there first is this error message: "The account is being processed. Please wait until processing is complete to get messages." I click OK on that message, and after a while, Tbird becomes "unresponsive."

I've tried deleting Inbox.msf, but that didn't help.

Sometimes, I get this error: "Unable to write to the mailbox. Please ensure the file system allows you write privileges and you have enough disk space to copy the mailbox." There have been no changes in Windows accounts, so it seems highly unlikely that there is a permission issue.

The hard drive on this system has about 233 GB free.

Where do I go from here?

After I set up my IMAP account on a Windows laptop, it had two Spam folders. Properties showed that the path of one ended in "/Junk" and the other path in "/spam". Note that they are both labeled "Spam" under the Home (not local) Inbox.

I just want one Junk or Spam folder, not both. Or at least be able to label one Junk and the other Spam.

Having two spam folders under the Home account with the same name is confusing. How do I fix it.

I have a number of pop3 accounts with the same mail host, but suddenly one of them gives me the 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 use Thunderbird on two Windows machines, and the problem is on both, so it is something in the interaction with the server, however, there is no problem accessing the mail via webmail directly on the server.

I have tried to change password on the account, but the problem did not go away. In fact, I got the box to tell me that the old password did no longer work, so I know that the problem pops up after log in to the account. Before the error message appears, the message "downloading 208 messages" (or something similar) briefly appears.

Is there a way to find out exactly what fails?

After the update to version 158.0 it opens and shortly afterwards freezes. i have opened in troubleshooting mode, uninstalled the app, disabled antivirus and deleted the msf files.

Nothing solves the problem.

I recently set up Thunderbird for Windows as a troubleshooting step for my Yahoo Mail account which has been generating an incessant number of authentication pop-ups in Microsoft Outlook (Classic) for Windows. I had been using New Outlook for many months before switching to Classic Outlook a couple of weeks ago. With New Outlook, there had been no authentication issues nor pop-ups appearing. I have been using the OAuth authentication, not app passwords, in all cases.

Setup within Thunderbird was relatively easy and the OAuth authentication went through without issues. The account has synchronized and seems to be continuing to do so as I read, delete, and send messages.

However, when I went in to the Activity Manager, I'm seeing a number of errors, appearing every 10-15 minutes or so. They read as follows:

• Alert from account xxx@yahoo.com: AUTHENTICATE Server error - Please try again later

• The current operation on 'Inbox' did not succeed. The mail server for account xxx@yahoo.com responded: UID FETCH completed.

• The current operation on 'Inbox' did not succeed. The mail server for account xxx@yahoo.com responded: p.

Can anyone help me understand what they mean? It would help me stabilize Thunderbird and might give some clues as to what is happening in Outlook Classic for me. It would seem some have authentication issues with Yahoo on different platforms while the service works perfectly fine for others. I would like to move away from Yahoo as I find it finicky with a number of its features, but I'm a long-term user (25+ years) and don't see that being a practical solution at the moment.

Thanks!

I need to increase the font size of the display. It is about 8 point. I cannot find an article that says how to increase the display when I first open Thunderbird. I can increase the font form the actual message or replies.