I-Thunderbird Community Forum

I'm new to the community and don't really know how things work, so maybe this is the wrong place for this. I had a seemingly catastrophic problem after updating yesterday. All of the emails sitting in my inbox disappeared, and were gone from the yahoo server as well. Long story short, I figured out what happened. In my filter rules I sometimes had a blank entry at the end of the list. Previously that had been ignored, but after the update it is now treated as a match. So the first filter that had a blank in it caused everything in my inbox to be moved to a certain folder in my Local Folders. Obviously, it would be legitimate to not allow blank entries in the filters, but once you've allowed it, you really shouldn't make a change. In the end the solution was simple, but it wasted a fair portion of my day figuring it out.

Inbound emails are going to Trash instead of Inbox.

No changes have been made. How can I check settings to find a solution? I see nothing related to this issue. Thanks for any help.

Thunderbird stopped receiving new messages on 02/09/26. I've tried all the help solutions several times and still nothing. I am at a loss. I can send emails, but have to go to virginmedia to see new messages.

I like to know what is the problem at my e-mail setting? Since two weeks ago, when I sent a message, receiver could get my message, but there were no sent record in my Sent Message box.

When I returned from a 20-day vacation, I had a message that “Thunderbird had a problem and crashed. We’ll try to restore your tabs and windows when it restarts….” I do not know when the “crash” happened. However, I have had problems with my 5 AOL email accounts and sometimes the 3 GMAIL accounts since August 20. The AOL accounts are the worst problems. Emails from one account are coming through under a different email account. This is happening with two accounts. Emails for one of the accounts is not coming through at all. I can read messages; but I cannot send any messages through any AOL account. Sending messages through the GMAIL accounts is sporadic in going through. Although my husband and I have separately checked all TB menu items, tools, & settings, we have not found the answer to correct my problems. Any help is appreciated.

Multiple Thunderbird Problems that started around 9/1. (Now 9/8/26) TB won’t properly download emails

   • Status bar will say “downloading 1 of 61”, pulse a while, nothing happens, then says “nothing to download”.
   • Yesterday there were no downloads 5 pm to midnight. Left on overnight in the AM there were 114 emails in box, 20 of them dated previous day 2:33 pm to 5:43 pm
   • Morning Inbox also contains 9 emails dated 8/31, which are duplicates of emails received on that date and placed in trash then.
   • It is a big business problem that I cannot rely on receiving emails in timely manner.

Many times cannot simply SEND email in TB

   • I will compose email, click send, and recently cannot expect send to be successful. Often get the message "Sending failed because connecting to Outgoing server (SMTP) failed"
   • Sometimes 5 minutes later I click SEND and the message is sent. Other times it will not send at all for hours and I am forced to use my gmail account to send an important email.

Have performed the fixes suggested online without relief

   • I have checked that the SMTP is correct. (Also sometimes SEND works)
   • Have deleted the file global-messages-db.sqlite 
   • Saved my profile, deleted the TB program, reinstalled TB, copied in my old profile.

I have my gmail emails rerouted to my outlook email address and in past week my emails are not showing up in Thunderbird for a number of days after they are visable in my outlook program. Why? I have compared my Thunderbird settings with my partner and they are the same. Only difference is that my partner picks up her gmail email directly, does not use outlook and does not reroute her emails. She does not have any problems with emails arriving late to her Thunderbird inbox. We are both using same version. Any suggestions?

Reinstall of Thunderbird after a few years easy with all my old (sub) folders captured from service provider. However, neither delete folder (via any option) nor create folder is acted upon. Also ignored is attempt to rename a folder. Inbox contains over 23 000 messages but none after 5 December 2025. Deleting hundreds permanently on provider has no effect on Thunderbird. Some folders are empty but but are labelled as containing hundreds of messages.

Trying to send a message results in error, 'Could not detect login form.' But I am logged in.

Any pointers to unclogging system gratefully received. Chris Oldman

I have set up 4 email accounts in Thunderbird. I tried today to set up another email account with the same domain. selected the New Account Button (email only); then pop up screen to add name of account user and users email address. next menu, TB was successful finding the server but a small yellow flag says "unknown hostname" but lists the 3rd party host, that there is SSL/TSL security and the user name matches the new account information just entered. Incoming settings looked correct. The next screen is Choose email account type and it was auto populated by TB and all info is correct. Next, enter password (for new account?) and TB fails to create a new account. Says Authentication error unable to log in at server. Tried doing the manual config. Outgoing server protocol shows SMPT when it should be IMAP (correct?) but the field is un-selectable. So results are same, Unable to log in to server.

the manual config screen has a host name field and it is autofilled with my company's name.domain but it is misspelled! Tried to edit but no success. I really need to get this new account up quick! So asking for any help available.

Hi Support,

For the past few days I have been using Thunderbird as my mail app for office 365 account and it has been working however today I have attempted to send an email and it has stopped being able to. I get prompted to re-enter the password go through the login and the 2FA and then get to the "You're all set" response page and when I go back to the thunderbird app I get prompted to re-auth again.

Are there any troubleshooting steps I can follow to find out at what stage it is failing?

I have it configured for smtp-mail.outlook.com with port 587, StartTLS and OAuth2 selected. A username is also configured.

My email was working then suddenly stopped. I have been connected to AT&T (Currently and Yahoo). I finally got it touch with AT&T mail. They claim that they no longer support or connect with Thunderbird.

Does anyone know if this is this correct?

Thank you for any help!

Or does anyone have any suggestions on what may have happened. This started one or two days ago from 09/09/2026

I have several Yahoo accounts set up in Thunderbird, but I get this frequent (several times a day) error notification from just one:

"The current operation on 'Inbox' did not succeed. The mail server for account Yahoo (xxxxxxx) responded: p."

I'm sure this is a truncation of the complete error message. How can I see the complete message?

There seems to be no consequence of the "error" - everything appears to work as normal. It's just annoying.

I don't know if this is the correct topic to select but there is nothing more relevant.I am using windows 11 and When I try to delete e mails (G mail) I click on the e mail and then delete. The e mail then disappears and I then quit out of e mails. However the next time i go into my e mails it is back again. The only way i can get them to delete is to again tick the e mail i want to delete and then click delete. If I then go into something else e.g. drafts or spam and then quit out of the e mails when i go back in the e mail i wanted to delete has gone. I have tried resetting firefox but makes no difference

Is this a known fluke. In group with more than one email I see the excerpts and can easily deal with them (delete) but if there is only one in a group I can do nothing?

When I open Thunderbird it is sending my emails directly to the deleted folder. I have tried all-sorts and cannot find an answer. I transferred Thunderbird to my new PC and all was working okay for a few weeks then all of a sudden there were emails missing from my inboxes and I found them in the deleted folder. I am 76 years old and need an easy step by step solution please ..... John