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My Charter.net mail has suddenly started to come into my inbox and automatically is moved to trash by Thunderbird. I do not have antivirus, i have not changed any settings, it is POP.

I have used Thunderbird with the same email account for years, creating subfolders and moving emails to the subfolders with no issues.

With Thunderbird 153.0.1, after creating a new subfolder in the account, when attempting to move emails to the new folder, I receive the following error:

"Thunderbird: The current command did not succeed. The email server responded: APPEND invalid flag list"

When I receive an email, all the addresses in the incoming email are added to my address book. As a result I get email addresses added of people I don't even know. I want to stop that.

Sending of the message failed. An error occurred while sending mail. The mail server responded: <anonymous@[10.0.0.31]>: Sender address rejected: not owned by user a1.914306843. Please check the message recipient "christine.krieger@a1.net" and try again.

why do I get this on new download

Using the system color theme, where my Windows 10 system is set to the dark color theme, I see Thunderbird 153+ Meadow showing popup menus with weird dark teal background. The standard Window menus (File, Edit, ..., Help) appear to use slightly different background, which still doesn't match my system color. Is there a setting I'm missing to have these menus shown with my system dark color theme (like current Fx, and previous Tb versions)?

I'm using my system color accent setting, but I'm seeing changing this Tb setting doesn't seem to affect the menus background.

I've also noticed I'm not seeing this on Windows 11 – the menus background is fine, although on Windows 11 I'm still noticing this teal "accent" appearing in certain elements of the popup menus, f.e. the color of menu item keyboard shortcuts.

Thunderbird demands my password for outgoing SMT server when I go to send an email but when I enter it, system won't accept it even though it is the correct password. I have had this problem for some time and it comes and goes. Sometimes I have ebeen able to send without a problem, then it comes back I had a helpful reply from this forum (can't find who posted it - Mick?) tellling me to go into the error console (Ctrl + Shift + J) and delete eveything in that. I tried that. It worked at first, but now when I do it, it has no effect. And the problem now appears to have become permanent, although occasionally after I have been working for some hours, then suddenly I can send without any problem. Problem hasn't budged though for a couple of days now. This is a mysterious and erratic gremlin, which now seems to have taken root. Any suggestions please? Carol

Hello,

My internet provider is RCN. For the past couple of months, I’ve occasionally been getting the message, “Connection to server imap.rcn.com timed out.” As a result, I’m unable to receive emails via Thunderbird.

All my settings are correct. Usually, the problem resolves itself within 24 hours, but sometimes, like this time, it lasts longer.

Any suggestions? Best, Magda

hi, snap thunderbird 155.0-1 ubuntu 24.04 keeps asking for passwords of all email accounts after upgrading thunderbird. all passwords are correct and they were not changed. the issue started today after thunderbird was upgraded to 155.0-1. this new version seems to have touched on oauth: https://www.thunderbird.net/en-US/thunderbird/155.0/releasenotes/

What’s New

- S/MIME popup shows signature, digest, encryption algorithms and key sizes

- Default address book for manually added contacts configurable with mail.addr_book.add_item_default_uri

- Enterprise policy DisableQRExport can disable QR export

- OAuth add-ons can override built-in settings for selected domains and hostnames

- Manual account config streamlined with Exchange, Graph, and custom OAuth support

- Custom OAuth support for IMAP and SMTP servers

- PKCE and external browser fields added to custom OAuth settings

- Enterprise policy DisableExperimentalFeatures for disabling experimental features

any idea how to fix this? thanks

The last message in my inbox was on 9/3/2027. After an update, now all messages are now going into a different folder, which has only one rule, and that is all messages from a specific email address. Just now, all messages from my inbox just emptied into a different folder. I don't know what happened with Message Filtering in the latest update, but I have to turn off filtering.

I have many years and email accounts on my old WIN10 workstation running all POP installations.

I have a new workstation with WIN11. Is it possible to install TB on my new workstation with my accounts installed as IMAP and keep the same folder configuration? I have many email folders and filters setup on the old workstation installation.

I would appreciate any installation recommendations. I've been using TB for years and would like to keep as much of the current configuration as possible.

Problem with message are going to the Trash folder, not the Inbox with all local folders in place. After taken in profile the local folders off, the new downloading from message are working just fine to the Inbox . What is the problem Thanks for helping.

Since I was upgraded to Thunderbird 155.0 64 bit (Meadow) snap version on my Ubuntu version 24.04 all incoming messages are going to my spam folder. I copied my old Thunderbord profile to my snap thunderbird folder to retain folders, settings etc. and although everything else works, my incoming mail is still going directly to spam. I have unchecked the 'enable adaptive spam' check box and also 'trust junk mail headers' box. I have run repair on my inbox and also the spam folder. I checked my mail server and the mail is not marked as spam there... Getting tired of manually moving messages from spam to my inbox several times a day...... Help!

MY second email account (droulston@btinternet.com) stopped working 3 days back (it has been OK for many years). I tried uninstalling and reinstalling but my password was not accepted.

TB is sending most of my email to the wrong folder. I had 21 message filters, but then I noticed that a lot of things were going to a folder named "bridge" for no apparent reason. I looked at the filter log, but there was nothing in the log for the last few months.

I did have a filter sending certain messages to the "bridge" folder, but TB is sending things there for no reason. I disabled all 21 message filters, and it is still doing it.

I have version 155.0 and I'm using Windows 11 25H2.

How can this be fixed?

As of September 3, 2026 all my new emails are going into a random folder instead of the inbox. This is also happening on my wife's PC plus and we are not getting the emails to our iPhones until we get out of Thunderbird. What has changed? This has not happened before.

Thunderbird has stopped getting messages and 'get messages' doesn't work & I have to close & restart thunderbird to receive them. Nothing has changed with the email client itself.

I know messages have arrived by checking my providers phone app, but for Thunderbird to download them to my PC I now have to restart Thunderbird to get new messages