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I have a number of accounts setup in Thunderbird, some are gmail accounts and some are Yahoo accounts.

After the last Thunderbird release one, a couple days ago, of my Yahoo accounts stopped working and wanted me to authentic it. It pops up with a Yahoo window to login. I tried to login with my username and password which didn't work so I went into Yahoo and created a new app password and tried that. It won't work either. I just get the message, something went wrong.

Then my other Yahoo account stopped sending out emails, just get a connection timeout message. Now my gmail accounts won't send out emails either. I can receive incoming emails, but not send out emails.

This is the message that I get when trying to send out an email now:

Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com timed out. Try again.

I have searched and checked that my Outgoing server settings are correct for both Yahoo and Gmail. I have a different outgoing server for each email account and they have different unique description names. Cookies are enabled, accept cookies from third-party sites is set to Always. I had Auto-detect proxy settings, have now tried No Proxy.

I am using Microsoft Defender for my virus protection.

This is how my Outgoing Gmail SMTP settings are set: Description: Gmail - xxx@xxx.com Server Name: smtp.gmail.com Port: 465 Username: xxx@xxx.com Authentication method: OAuth2 Connection Security: SSL/TLS

This is how my Outgoing Yahoo SMTP settings are set: Description: Yahoo SMTP - yyy@yahoo.com Server Name: smtp.mail.yahoo.com Port: 465 Username: xxx@yahoo.com Authentication method: OAuth2 Connection Security: SSL/TLS

Any ideas of what else to try would be greatly appreciated.

Thank you

I was able to access my Yahoo email with Thunderbird by using the OAuth2 authentication method. However, I am not able to send a email using the yahoo outgoing server. There is no selection for OAuth2 for the outgoing server. I get the message "The message could not be sent because connecting to Outgoing server (SMTP) yahoo failed." What do I need to do to be able to send email via yahoo?

emails over 5 days old are deleted: -

Hi i had trouble with outlook so changed to thunderbird for two email accounts i have. both are IMAP. one account works fine , old emails are stored asa re deleted and sent, however for my main (business) email, if i turn the computer off, i basically loose anything older than 5 days.

i have the settings set to do not delete, but it keeps happening. sent items are kept, as are deleted emails, so i cant understand what is going on. the account also clears the server so i cant bring them back from there either. any ideas? if it keeps like this i will have to go back to outlook.

When launching Thunderbird, I get a pop-up saying Server "outlook.office365.com" reported en error. Further not all sent email are showing in the Sent Items folder. How do I track down and fix the error?

Many thanks!

Tim

Hello, Thunderbird stopped downloading my emails from [edited from public] @erols.com How do I reset ?

Edition Windows 10 Home Version 22H2 Installed on ‎8/‎18/‎2020 OS Build 19045.6691

Device Name Patrick-PC Processor Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz 3.40 GHz Installed RAM 8.00 GB (7.70 GB usable) Storage 4 GB HDD ST1000DM003, 119 GB SSD Samsung SSD 840 PRO Series Graphics Card Intel(R) HD Graphics 4000 (224 MB) Device ID 8A8FD085-FB3C-4423-9BCF-1B704DA63161 Product ID 00326-10000-00000-AA600 System Type 64-bit operating system, x64-based processor

My company uses your email software and everyones email is not working. For example, my email (madison.l@valleyhha.com) does not allow me to send messages without an error popping up (Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors. You can retry or save the message locally to Local Folders/Sent-madison.l@valleyhha.com.)

This goes for my entire staff of 20 people. Same error, also all my unread messaged in my inbox have now disappeared. Not only that but we are also not receiving any new emails either

Hello! After I was on vacation for about 2 months, I suddenly couldn't receive any more emails. "Login to the server imap... failed." Why this - and what can I do? Thanks!

Bonjour, J'ai créé un message d'absence pendant mes congés, ce message à généré une saturation de ma boite mails, depuis je n'arrive plus à faire fonctionner correctement Thunderbird. Le lien entre Gmail et Thunderbird semble ne plus fonctionner. Comment dois-je procéder ? Est-ce que je peux réinitialiser les paramètres de Thunderbird sans perdre de données et si oui comment ? Merci

I am unable to connect Thunderbird to my “Personal” Outlook.com mail account. I installed Thunderbird on a new laptop with Win11-home. I connected to yahoo and icloud without issue. In the past I used an app-specific password to connect Thunderbird to Outlook. But Microsoft no longer allows me to make app-specific passwords on a personal account. I have two factor authentication on the MS account. I have tried turning off virus and firewall protection, without success.

When I create a new email account in Thunderbird I get the following error. “Authentication failed. Please check the username and password - Exchange auth error”

If I put my personal name in the Your Logon field, rather than my email address, I get a Microsoft screen pop that shows “oauth2” in the URL. But if I click the personal account they present it quickly fails.

Is there a workaround, to fix this, since I can’t get a app-specific password and have two-factor authentication on my Microsoft account?

Thank You for any help you can provide. I have spent a day researching this without success.

Kurt

A small proportion of my sent emails are not appearing in my sent folder I use a Gmail account via IMAP. ⁠I've checked my account settings, and the sent folder is checked correctly.

As of today (6th Jan '26) TB claims there are no new emails. This is incorrect, they are there on Gmail, and have appeared on my iphone. Can't find any way of getting TB to play nicely with Gmail, any suggestions for a work round gratefully received.

Hello. My name is Chris Bottle and I live in Australia. In the last couple of days I've discovered that I'm unable to send emails. I've checked my IMAP settings are they are all correct. My email provider is Telstra Australia. When I send an email I get a reply back "An error occured while sending email. Outgoing server SMTP error. The server responded; Connection refused - OB119 .103.224.52.151 is blacklisted in Abusix Mail Intelligence and then two lines of text prefixed by https;/lookup.abusix and further text. I checked with Telstra and after much checking they could find nothing their end. I'm not that computer literate and freely admit that this problem has bamboozled me. I hope somebody can help with this problem. Many thanks. Cheers, Chris

I'm dealing with a properly updated 'bird: 140.5.0 (32-bit) running on an equally updated Windows 10 desktop. First thing this morning, out of nowhere, I started getting an "unable to write the email to the mailbox..." message when sending, thus I could send but not save. And then I realized I wasn't receiving either, on all three accounts in my Thunderbird. I stopped everything and focused on trying to fix this. It's been an all-day, losing effort. So far.

I tried the various quick checks and fixes recommended here and there: I'm running the program as an administrator. I restarted the program. I rebooted the computer. I think I have enough disk space, but to be sure I deleted some bloat from possibly overly large files. I compacted, even though the program is configured to do that regularly. I temporarily disabled my antivirus program. I went into my webmail and deleted all messages that have arrived since my Thunderbird stopped receiving, in case one of them was corrupted. And probably some other attempts as well. Nothing has helped.

And now a second, even worse issue has fallen from the sky. Thunderbird opens. The folder list is where it always has been. The number of unopened messages in each folder is there in boldface, as always, but...the folders are all blank and I get the dreaded popup: "unable to open the summary file...." Have I lost my years' worth of carefully curated emails?

I've tried folder repair. I've deleted parent.lock. Etc. Nothing. Nothing. Nothing.

I will be super-grateful for any wisdom sent my way.

I've used Thunderbird for over a decade with the same email address and log in info. My email address is [edited]@pacbell.net. I receive email regularly, but starting about 3 weeks ago, outgoing email actually gets sent only about 30% of the time I hit the send button, and the rest of the time I get the following message:

"Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) outbound.att.net failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.

After I try several more times, I can usually get the email to go through.

What can be done to fix this?

Tom House [edited]@pacbell.net