Thunderbird Community Forum

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

I have created a new gmail address for my wife. Would like to add this address to my existing Thunderbird Mail account so that her emails also come to my Thunderbird email account. Not sure how to add her address to do this.. Thanks

I have the Thunderbird desktop installed on windows 10 computers that are blocked from any internet browsing. I am not able to find instructions on how to share calendars between computers.

I am able to export and import calendars between computers, but the events only show up in the side bar as tasks. We want to be able to edit the shared calendar from any computer.

thunderbird 140.8.1 will not run unless restart of mac mini ios15.7.4 sequoia. only runs once then will not run email again.

Can I back up to a previous version that did run or is there an issue?

I made a folder and called it April. One day the folder just disappeared. No one seems to help me recover the folder and i need it. Once I moved emails into that folder they are no longer available in my inbox. SO if you know how to recover my folder help, or if you know how to recover emails that were sent to a folder, that would work also. I use Windows 11 and I have the most recent release of Thunderbird. I use Charter.net as my isp which is pop. Thanks,Charles

seem to have a problem with OAuth2 and my aol accounts in thunderbird. can't send or receive emails to/from my aol account on thunderbird. this seems to have something to do with change to OAuth2.

Importing CSV address books does not work properly. The resulting folder cannot be accessed by emails to be sent.

The imported Address Lists cannot be used in an email as a list. The error message is that the address is not a valid email address. However, if a new Address List is created with the contents of the imported file manually copied, then it can be used as an email address.

I also found that clicking on an individual address in the imported csv, will open the individual email address.

So the addresses are valid but the list is corrupted.

When I search for a name in Thunderbird mail e.g Lennart, nothing from 2026 comes up, only older mails from 2025-12-31 and backwards. if I search on his e-mailadress, e.g l.name@ppost.se it finds avery mail. What is wrong?

For some time now my primary email address gets wiped clean every night and is empty every morning. I have to transfer received mail to another input address to keep it safe!

I send out golf group e-mails. I have myself (e-mail address) in the group, so it will also come back to me. The server keeps rejecting my group e-mails because it says my e-mail address is incorrect, I have checked it several times and it is correct. I even edited it to be sure. Why is the server still rejecting it?

Thanks for your time....Paul Smart psmart@triad.rr.com

Using Acronis True Image for Western Digital (ver 2025 build 41936) to backup my files on a daily basis. Recently the backup program has been stopping and reporting that it cannot access some Thunderbird files, even when Thunderbird was not running (1st image) I tried 'Compacting all Folders' in Thunderbird but the result was the same (2nd image). Lastly, I tried clearing the cache - the result is the same. In all cases Thunderbird was not running during the backup.

i realize that this is not a Thunderbird issue, but I've been unable to get help elsewhere. I wondered if anyone might have a solution since Acronis apparently sees the file as being accessed - is there a way to remove that?