Thunderbird Community Forum

Program : Thunderbird Build - 115.18.0 esr .

How to reproduce:

Log into outlook.live.com an ensure IMAP is enabled.

Start Thunderbird and create a new 'mail' account manually, given the account settings provided by outlook.live.com. (https://support.microsoft.com/en-gb/outlook/pop-imap-and-smtp-settings-for-outlook-com)

The account may have to be setup manually.

Also you may have to setup the outgoing SMTP server to use OAuth2 manually as an SMTP server directly, as the normal dialog presented during manual setup did not provide this option unless the servers were set up indvidually.

The e-mail account details should be set up.

What should have happened:

SMTP server should have permitted Ouath2 authentication during setup. Thunderbird should have presented a login to obtain a password, and retrieved messages to a local inbox.

What actually happened: "Authentication failure when connecting to server outlook.office365.com"

Possible causes :

• Build not actually supporting Oauth2 despite claiming to.
• Third party server is claiming to support IMAP/Oauth2 but refuses to recognise credentials sent by Thunderbird.
• Build too old.

Thank you.

TB is not downloading pop3 emails again.

What does this mean?

NetworkTimeoutError: a Network error occurred Pop3Client.sys.mjs:380:18 SecurityError info: Pop3Client.sys.mjs:440:20 SecurityError cert chain: legacy.pop.mail.yahoo.com; serial# 07:CF:5F:D8:B7:96:17:C0:9F:C0:58:12:90:5A:41:8F <- DigiCert Global G2 TLS RSA SHA256 2020 CA1; serial# 0C:F5:BD:06:2B:56:02:F4:7A:B8:50:2C:23:CC:F0:66 <- DigiCert Global Root G2; serial# 03:3A:F1:E6:A7:11:A9:A0:BB:28:64:B1:1D:09:FA:E5 Pop3Client.sys.mjs:445:22

I always keep program icon in tray and when a new/unread email arrives, a separate yellow icon would pop up next to it... Well, after updating from 158 to 159, that new/unread icon is no longer popping up. Now I have to periodically click the main program icon to open Thunderbird and see that there's tons of new/unread mail sitting there, but that yellow tray icon never showed!

I would like to roll back to 158 but it is proving to be quite difficult.

Each time Thunderbird downloads incoming downloads, the graphic below asks for either Deny or Allow. How do I stop this as it irritates me.

Thanks. Barry Eslick (+27) 0782184507

barryeslick@gmail.com

cannot seem to send emails to multiple people without going thru mail merge. I can no longer type the persons name in to: field and it will not autofill. I tried to go to calendar function and got a blank screen.

Can I go back to a previous version?

Current official docs explains how to backup and move your profile, it assumes you only have one. I have multiple profiles which means about a 20GB backup but I only want to backup one specific profile (<2GB).

The backup is not for recovery but I need to keep a history records for a specific account which can be accessed through Thunderbird even if the original email account no longer exists.

To backup/copy its recommended to do it for this folder %APPDATA%\Thunderbird\Profiles\ (about 20 GB)

While all I need is %APPDATA\Thunderbird\Profiles\xxxxx.default-release\ImapMail\Important_stuff* (2 GB folder and .msf file)

Any better solutions than these?

1. Use a backup method that excludes specific folder and files in backup/copy of
2. Have a completely different installation of Thunderbird that only does the Important_stuff account (Thunderbird portable looks like it might do the job).

I suspect the first version will pick up a lot of unnecessary configuration and other stuff.

I was not able to boot up my Thunderbird email client and had to reload it. But after I got it going, I realized there are many missing folders, and there is a lot of missing messages in my "sent" folder. Why?

I reset my Windows10 computer last week, reinstalled Thunderbird and got it to work as POP3 for about 5 days, but now it won't connect to my e-mail account (@prodigy.net), which I normally access through Yahoo Mail. Then on Wednesday, it just stopped working.

Last week I had to enter a passkey in as the password, but it still needed to be set as a "Normal Password". This week I have tried the same passkey as "Normal Password" which doesn't work. I tried using the passkey but specifying "OAuth2", and it doesn't work. I have tried the "Normal Password" with the password I use to get to the Yahoo Mail account on line, and it doesn't work either.

The message I get is "Authentication error" and "Unable to log in at server. Probably wrong configuaration, username or password." So, I thought I might change the passkey, but now I cannot FIND how to change, remove or create a passkey. Not at Yahoo.com nor at att.com. Can you help me? Thanks, Deb Fisher

This just started yesterday: When I open thunderbird my inbox does not show up unless there is a new unread email in it. Also my previously set display columns and tool bar all have to be reset each time I open Thunderbird.

I've been using Thunderbird for a good while now and love it. One thing that I find very frustrating though - it doesn't auto capitalize, such as A and I (one word). Is there any way to make it do this? Thanks

Since yesterday , Thursday 29th October. Thunderbird has only been displaying the "Inbox" for my account, no emails are visible in it and all of the directories including the deleted emails directory and spam directory are absent. I have Windows 11 installed. I am using the IMAP server for incoming email and have checked that all the settings are correct. My account displays no incoming emails but can send emails. The directories are still absent when running Trouble shooter and the inbox is still empty. In the Account Settings - Server Settings I tested connection to the server and it said secure connection made - this worked for both outgoing and incoming servers. I have tried uninstalling and reinstalling Thunderbird but the issue persists. Although I do not change any settings the full set of directories will occasionally appear along with some emails and then seconds later disappear again. My email account is working fine on my phone and tablet using gmail.

My personal Outlook.com account can receive emails normally through Thunderbird IMAP, and sending emails through Outlook.com webmail also works.

However, SMTP sending in Thunderbird fails even though Microsoft OAuth2 sign-in completes successfully.

SMTP configuration:

• Server: smtp-mail.outlook.com

• Port: 587

• Security: STARTTLS

• Authentication: OAuth2

Thunderbird's Error Console shows:

• 535 Authentication unsuccessful

• Error during AUTH XOAUTH2

• 500 Unrecognized command 'Length: 7'

I have verified the settings and refreshed my OAuth2 credentials. The error persists.

This appears identical to Mozilla Bugzilla issue #1917321.

I contacted Microsoft Support (case #7111097598), but the agent referred me to Thunderbird without confirming whether SMTP AUTH is enabled for my mailbox.

Could someone help determine whether this is an OAuth2 configuration issue, a Thunderbird compatibility problem, or a Microsoft-side SMTP restriction?

My TB installation got corrupted due to a hardware/disk issue. On restoring it from backup TB keeps trying to download all messages again. I know this is something to do with the popstate.dat file but I can't seem to stop it. What do I need to do?

Also, I had never noticed this before (because I never looked at the TB file system) but TB created multiple folders for the email account.pop.mail.yahoo-1.com up to pop.mail.yaho-4.com. Why does it do this and is there a way to get back to just one file? Is this something to do with TB crashing or what?

Is it using all of these files or just the latest and how do I know? All of these folders have a popstat.dat file and one has multiple following the popstat-1.dat etc.

I've no idea how to recover from this. Any help would be much appreciated.

Over the last couple of days the general appearance / layout of Thunderbird has changed for me. I have attached a screenshot of how it appears now, previously under the 2 talktalk e-mail addresses I had a number of additional folders I also, under SPAM, had spam folders for each e-mail address, in fact I had 2 for each of the talktalk addresses.

I first noticed the changes yesterday but after shutting Thunderbird down I got most of the old layout back, but today I see only what is in the image.

Is this some sort of an update or has my installation been corrupted in some way.

I have several email accounts in Thunderbird where the email address no longer exists, at least on the specified IMAP server. Thunderbird is configured to not attempt automatically getting mail for these.

I had used Thunderbird 102 on Windows 10 for years, and in that version, my mail was kept in Thunderbird for those accounts (though whenever I opened any folder in them, I was somewhat annoyingly prompted to enter my credentials since the connection to the server was failing). To copy my profile folder to a new Linux installation, I updated Thunderbird to 153.5.1esr, the same version running on Linux, as Flatpak. My mail is still kept in Thunderbird on Windows, but with the same profile on Linux, Thunderbird "hid" all folders from the offline email accounts (apart from an "Inbox" folder that is shown as empty): the files are still there in the profile directory, and Thunderbird seems to find relevant emails in search, but opening them leads to a "No mail found" screen, and there is no way to access this mail from the folder pane. How can I make Thunderbird see my mail again?

As if that was not enough, on a whim I decided to attempt the "Repair folder" option on my Windows instance of Thunderbird, where the folders were still being shown normally. I immediately regretted not having made a backup of my profile (I only have one from version 102, where the data was apparently stored rather differently), since this just deleted all mail in the selected folder entirely, with the relevant file in the profile directory being empty. (The file seems to be somewhat different on Linux too, since copying it back to the Windows profile did not restore the mail in Thunderbird, and I would probably have to copy my Thunderbird 102 backup into an install of Thunderbird 102 and manually upgrade to my/the newest version to get it back.)

I know local folders would never be deleted like this, but there does not even seem to be an option to move an entire mailbox into a local folder, other than manually. It does not appear like Thunderbird has proper support for mailboxes that are no longer available. It would be undesirable to have all my mail in some new mailbox lost in the same way after I lose access to it. (Local folders would not really help in this situation either, unless you plan out exactly when your mailbox goes offline.)

My Thunderbird installation (159.0/Windows11) has evidently just updated, and my Calendar tab is suddenly a complete blank space. There's a support article here that appears to discuss exactly this situation, and gives precise steps for getting into "Config Editor" in Advanced Settings, entering a long search string, and issuing a Reset command. (Mail and contacts are just fine.)

Which I tried...

But there is no "Config Editor" button in the dialog I get when clicking Advanced Settings at the bottom of the Settings tab, only a mostly blank screen with no list of settings and a dialog box in which one can enter text (with options for "Boolean", "Number" and "String"). And entering the search string given in the support article produces, with a bit of finagling, a toggle that will change its setting from True to False and back again (and a trash-bin icon that offers to delete it), but neither "True" nor "False" produces any instance of a "Lightning" extension in my list of extensions (which is short and uncomplicated), so (a) I can't delete the extension as instructed, because it's not there, and (b) restarting Thunderbird only continues to give me the unhelpfully blank Calendar tab. (And I do mean "blank" here - there isn't even an empty calendar grid on that tab at this point.)

I *think* the article is probably right that my data is still there (I can see .ics files with current dates in File Explorer), but at this point I can't get at it and can't seem to get the interface unstuck.