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Shortly after my Win10 x64 ver 22H2 update on tuesday 5/13, my Tbird fails to save any sent message with an attachment to the local sent folder. It is sent correctly and saved with attachment in the IMAP server's sent folder. The same message sent with no attachment will correctly be saved to the local sent folder as it should. In both cases the message "saving to sent folder" is displayed. The TB version was just updated to 128.10.2esr (64-bit) and issue continued as before. PC restarts make no difference. SFC system scan finds no issues. Had no issues with this PC & TB over last 5 years until now. Issue is annoying, since I frequently use the local sent folder to forward messages to additional recepients.

Hi I have been used to Thunderbird responding to my beginning to type recipient names with a list of matches. Suddenly it has stopped doing so. I have checked that all my addresses are still present in the Address Book (relief!), but I note that the Contacts sidebar is completely empty (even the Address Book options are missing). I can't find a setting to correct this, and would be very grateful to know how to revert to the previous good performance. Thanks

Suddenly, the conversation view has disappeared from my Thunderbird. This happened in version 128, and I have now updated it to the latest version, 138.0.2, but the problem persists. Previously, if I selected any message and right-clicked, there was a local menu option 'View as conversation' (or something similar - I use a localised version). Now, if I right-click the message, it opens with only two options: 'Open in a new pane' or 'Open in a new window'. No conversation view. The default shortcut (CTRL + SHIFT + O) does not work either.

(I did not change any settings, I only compacted folders and tried to rebuild thir index because the global search did not find existing messages.)

Any help on how to restore this functionality would be very much appreciated! Thanks

A few days ago I stopped getting my mail. I checked to see if the firewall was set to allow Thunderbird. It was. I tried changing account settings. I found out that if I changed Connection Security from STARTTLS to SSL/TLS there was no change. But, if I went to NONE my mail came through. Fine, but I don't want to go on without Security. Any suggestions?

Ed

unable to send emails, "the message could not be sent because the connection to Outgoing server (SMTP) mail.alburyathletics.com timed out

Thunderbird opens okay, but does not check for new emails. If you press it to manually trigger a refresh - it does not react. It just constantly says DONE in the bottom left hand corner

Running version 128.10.1esr. This version and the two previous mark 50% of incoming emails as ***SPAM*** and put in Junk folder. Turned off SpamAssasin. Marked all as not junk. Added all addresses to address books. Nothing fixes this problem. There is no way to contact Mozilla directly for a solution so I am posting here. No, this is not email coming from a third party account like Gmail. No, it's not inheriting spam designations from another server. This is broken junk settings on the previous two versions of Thunderbird. Mozilla, please fix this.

Thunderbird(TB) gets mail from Hotmail, my own domain, and gmail. I've use and auto-updated this program for the past 20 years. This is the first major problem I've had. Nothing has changed, ie: updates, new programs, or the like.

TB has stopped retrieving new mail since 05.12.2025. I can send mail but not receive mail. ALL settings are correct. I can go to the original sites individually and all the mail is there. Obviously I can send and receive mail on those sites, but TB will only send mail not receive it. The only thing I have not done is uninstall/reinstall.

Does anyone have any suggestions?

I am using ThunderBird, and when I mistakenly sent to the wrong recipient, I did not receive an email indicating a sending error (bounce). It is not in my spam folder or trash folder. What should I do to receive emails indicating a sending error?

hi 大家好， 我用的是thunderbird115，imap协议收入邮件。我发现我的thunderbird 位置文件夹非常的大有565GB，但是我的邮件占用服务器的空间却只有40GB。我查看了我的配置文件夹里的内容，发现有很多名字为nstmp-数字的文件，有几十个，这些文件大量的占用了我的硬盘空间。想问问这些nstmp文件有什么作用，能不能删除他们，删除他们会对邮件有什么影响吗？谢谢大家。

Whole thing running very slowly. Keeps trying to compact folders, Inbox I think,. Have about 88 000 messages in Inbox. Could just delete older ones, say older than a year. Any simple way of doing that?

I couldn't get emails to download from server. This began 2-3 days ago, for no apparent reason. I got 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've never made any changes to the default program, so 'something' (maybe new update?) caused this problem (to my TB & and hubby's TB!) I tried to delete a LOT of emails and compact the file, but TB froze and I can't continue to compact, and CANNOT EXIT the program to try to restart. There's no way to try to fix this as long as I can't get TB to respond.

Interestingly, both my hubby and I had the same problem and it began during the same time period. We both have Windows 10/11. To try to fix his TB email, I deleted 5000+ emails, set the system to retain only the last 150-200 emails, and then was able to COMPACT the file. This seemed to magically return the email to its previous working order, and all current emails were downloaded. (Fingers crossed that this will still work properly when he checks email later today; others have said the problem returned.)

However - I'm not able to use the same 'fixes' to get MY TB to load email. I tried to delete a lot of emails and then 'compact', but it FROZE - showing this message: "Compact folders (Not responding) Thunderbird needs to do regular file maintenance to improve the performance of your mail folders. This will recover 685 MB of disk space without changing your messages. To let Thunderbird do this automatically in the future without asking, check the box below before choosing ‘Compact now’. " I can't get TB to recover the 685MB of disk space because it won't respond to anything.

I'm stuck. I hope someone can help. I checked some possible fixes via the community, and threw up my hands in despair when many of them needed 3-5 pages of instructions to complete the task! Help please? Thanks in advance.

Following the latest update (may 20, 2025) When any message is deleted, the entire inbox becomes empty until the program is closed and reopened. (then they all reappear). I am running windows 11. Thanks for any help

I am having recurring problems sending e-mails, not knowing when it is going to work or not. The following message is one that I usually get:

"Sending of the message failed. An error occurred while sending mail. The mail server responded: <info@axxxxx.co.uk> recipient rejected - relay denied.

Please check the message recipient "info@xxxxx.co.uk" and try again."

I also get the following message when trying to send:

"Login to server mail.madasafish.com with username btom@madasafish.com failed."

These are my current settings:

Details of selected server: Description: btom Server Name: mail.madasafish.com Port: 25 User Name: btom@madasafish.com Authentication method: Password, transmitted insecurely Connection Security: None

I haven't changed any settings from the last time I was able to send e-mails, so I would appreciate any help.

Within my means, i am a keen su[[porter of Thunderbird, but I must confess I am really getting fed up with it. Recently I have been having A spate of problems. I recently had a problem where all my inbox mail ended up in my trash folder and you provided help to solve this issue, thank you. No sooner had that been fixed when I then booted Thunderbird up and, although all folder in the left hand page were there, all present and correct, there were were no emails listed on the right hand side except the Thunderbird home page. Do I just give up on Thunderbird for fear of what next problem looms up unexpectedly?

I open TB and everything is fine = about 6 accounts. At some point, all accounts stop showing emails in the right pane. The navigation pane still shows the email count in each account and folder. A message in the right pane says there is no emails to show. The only way to get it back is to close TB and restart it. What is happening and how to fix it????????? W11, TB 1.38.0.0 x64

Thunderbird has started opening a "Reply to sender with a copy to myself" e-mail when I double click to open an e-mail. If I actually send a reply, the original e-mail disappears from my Inbox. How do I stop this? Thanks.