Thunderbird Support Forum

I can receive emails to my (protonmail.com server) email account on Thunderbird. But I cannot send emails. This is the error message. "Sending of the message failed. An error occurred while sending mail. The mail server responded: Error: no such user. Please check the message and try again."

Thank you for your help!

rj

Yesterday I downloaded Thunderbird to Windows 10 (64-bit), added my Office 365 (for work or school) account, rocketmail account and iCloud account. I created unified folders for the three accounts. I have downloaded the TBSync add-on with the required CavDev (?) one to connect my iCloud calendar.

After successful use the first few times, now Thunderbird becomes unresponsive within 5 seconds of opening, every time, rendering the program unusable.

Troubleshooting mode does not fix the problem, so I assume it's not the add-ons, nor does starting my PC in Safe Mode (F4 at startup ie no networking), so I assume it's not antivirus.

I uninstalled Thunderbird and re-installed from the website today. All my accounts were there (so I wonder if the uninstall didn't work properly, although I assume that it's just the files left on my computer that the new Thunderbird installation is accessing).

All these attempted fixes leave the problem unchanged: the window freezing within seconds of opening.

Because the program becomes listed as 'not responding' and greys out on further clicks, I have to hard-close the program using Windows, selecting 'Close the progam'. Clicking 'Wait for the program to respond' leaves the screen greyed out, and nothing changes for at least 20 minutes (the maximum I've tried waiting it out). This also means that it does not yield a formal crash report, because Thunderbird does not recognise it has crashed.

On one occasion it did create a crash report, which I submitted. I am not sure what behaviour allowed this to happen, and I have been unable to reproduce it. That particular crash ID was as follows:

Crash ID: bp-41096385-eebe-4ccc-a47e-f76300240417

Any help much appreciated! I'd love to stick with Thunderbird if possible.

Since the latest upgrade to 115.10.1 (64-bit) I have an issue about running Thunderbird.

From a clean Windows 11 start up it is OK but then if I then Exit and then try to run the bird again it does not start.

Digging around I discovered using Task Manager, a number of Thunderbird processes run after I had Exited. See attached.

Any thoughts?

The message field is too narrow for all messages, except pure text messages. A screenshot is attached. How can I modify the userChrome.css so that all available space gets used?

Thunderbird is using 20-25% cpu and is very sluggish. (This is a relatively new problem - within the past 4 months).

I have two gmail IMAP accounts and one POP account. All show about 30-40K messages. I am working on deleting messages from the servers and local archiving thinking that maybe the problem is with synching or compacting(?). Anything else to focus on? Is there a way to tell, or place to look for what is consuming so much cpu?

Re-running in troubleshoot mode with add-ons turned off does seem to help a little, but it's temporary.

Thanks

George Redden Idaho

Since the latest thunderbird update 115 I have multiple crashes & black screens, before this it was very stable. I have been using this since 2015 I think with little problem until now. If nobody else is having problems with 115 perhaps I should just use windows restore to go back to Dec 10th 2023. The only alteration to settings I made to try and fix it was to untick "use hardware acceleration when available". It made no difference.

Thunderbird will not open. the error message is: "Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window." Pressed the "Close Thunderbird" button, but no response. Checked Task Manager and ended the Thunderbird application...still no change. Uninstalled Thunderbird and downloaded .exe file and installed...still the same error message. Rebooted the computer...still not change. Can you please assist with this problem. Thankyou I

Apparently the latest Thunderbird update is causing our Windows 11 print spooler to stop. I've seen this problem talked about elsewhere but have not seen a solution. The spooler has to be restarted, otherwise no app/program will print, since only Print to PDF is then available. This is making Thunderbird almost useless to us. Help.

Suddenly today Thunderbird won't access either of our Hotmail accounts. Error message reads "Login to server imap-mail.outlook.com with username my.name@hotmail.com failed." After several prompts to Retry/Enter New Password/Cancel, I even put the correct password in with no success and eventually received another message "Server has disconnected. The server may have gone down or there may be a network problem." Neither of these are true: I can access the server on my browser so I know the password is correct. Both my late husband's and my hotmail accounts are affected this way. Help! I am nearly 80 and not terribly computer literate and somebody else set Thunderbird up for me years ago because I wanted to be able to archive my messages locally (offline) and now it's suddenly stopped working.

Unable to start -> Side-by side configuration error message Unable to uninstall -> Another Message says there is an unfinished thunderbird update, must restart pc. after restart, no update starts. back to the same situation. Unable to Re-Install -> Downloaded Installer, but installation gives the same "unfinished update error"

I already copied the "Thunderbird" Folder from the "AppData/Roaming" Folder. Is this the correct Data Backup so I don't loose my emails?

Please help.

Не отправляются письма ни из одного адреса через приложение Thunderbird. SMTP протоколы настроены правильно. Один из адресов использует стандартный протокол mail.ru, но письма тоже не отправляются. При этом входящая почта доставляется в нормальном режиме. Если зайти в почту через браузер, письма абсолютно нормально отправляются. Как решить данную проблему?

Good morning I have updated Thunderbird to the lastest version 115.6.0 (64-bit) on my Mac with Ventura 13.3.1 (22E261) and now I can not see my mailboxes and folders. Have tried everything - nothing works. Rest bookmarks work. Contacts and other functions. I can create and send letters from any of my mailboxes, I can search letters in all mailboxes in search field, but I can not see on the left bookmark nothing - empty list of mailboxes. I have download the program again, reinstalled, changed Thunderbird file in Programms - same thing. Please help.

Hello. Currently receiving the following error pop-up with Thunderbird 115.4.1 on Win 10 22H2:

"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."

This occurs when fetching new email from an sbcglobal.net POP3 account. Settings: inbound.att.net, port: 995, SSL/TLS, OAuth2. These settings have worked successfully for years until yesterday NOV 6 2023.

I have several other POP3 accounts all using the same settings shown above but none of them are triggering the pop-up error.

Can an expert please advise the specific conditions that trigger this error so I can determine where the fault lies? Example: Is this Thunderbird's interpretation of an error condition being transmitted by the email server requiring interaction with service provider? Is this Thunderbird's response to an internal problem like not enough disk space? (even though there is plenty)

A solution would be nice, but an explanation re: the triggering mechanism is absolutely required. Thanks.

Hi All, Greetings!!! For the past two days, I have got the error like "Sending of the message failed. The message could not not be sent because the connection to Outgoing Server (SMTP) timed out". So I have restared our router (Broadband Modem), and then tried to send the mail, but the result is same. Then I have tried using my mobile network (using hotspot method), this time mail was sent sucessfully. Please help me to solve the issues...

Thanks Karthik

Sending of the message failed. An error occurred while sending mail. The mail server responded: <nancylynn@charter.net> sender rejected. Please verify that your email address is correct in your account settings and try again. I started getting this message yesterday when I try to send e mail. The e mail address is correct. Is this an issue with Charter.net or Mozilla?