Thunderbird Community Forum

Whenever I start my PC, the first time I click on the Thunderbird icon at the bottom of my screen (is that still called the taskbar?) I have to click on it a 2nd time to get it to open. After that I only have to click on it once. Does anyone know I can get it so I only have to click on it once the first time as well as understand what may be causing this problem?

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?

Authentication error. Show less

Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgAccountManager.createIncomingServer

I'm getting the above errorr. I cleared out my cache and still does not work. I did have trouble with accepting the setting and seem to get thru that part but authentication still not working.

153.5.1esr (64-bit) Release notes

That's the version I'm using and trying to authenticate to my gmail account. What is going on? Phillip

Hi,

I've started experimenting with Vibecoding some extensions for myself.. But I keep hitting a problem where TB reports back that folders are stale.

Specifically I'll hit something like this:

[Exception... "Component returned failure code: 0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) [nsIMsgFolder.messages]" nsresult: "0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)" location: "JS frame :: resource:///modules/ExtensionMessages.sys.mjs :: getMessagesInFolder :: line 925" data: no] ExtensionMessages.sys.mjs:928:13 [Exception... "Component returned failure code: 0x80550005

Usually when I go look at these folders in the UI, the total-email-count for the folder in blank, but the Size of the folder will show >1kb (eg .. something greater than zero). If I click on the folder, TB updates the summary file and all is well, for a while.

Some folders do report as no messages, and "blank" for file size as well.. but those seem to be genuinely empty.

These types of issues are causing pain in several extension ideas I've had, and I can't seem to figure out a way to handle them.

For example: I had an idea to create and extension to delete empty folders. The original version would encounter these NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE folders, and then just wipe them out as TB told the extension there were no emails in it. I found this out a little too late for some folders..

Another idea was to create and manage Virtual Search folders automatically. But I've hit a similar issue there with this staleness and had to skip such folders.

I've tried to get the extensions to trigger rebuilding summary files when we hit this error, but that never seems to do the job. The only method I've found is to open the folder manually in TB. Sometimes I'll find that starting a Search across the folders also helps - but that also tends to bail out unexplained.

I'm working with a lot of emails and folders..

If anyone can help explain why TB "forgets" whats in a folder, and how to trigger a summary-rebuild for a specific folder I'd be interested in hearing it.

Thanks

Usually when I open mail, there are boxes next to each email that I can click to delete. They are gone and I have on the left side a vertical list of tabs that begin with Mail, Calendar, and People and others follow. This panel was not there before and I cannot figure out how to remove it--I think this will restore the boxes I use to delete emails.

My calnedar is frozen. On the left side is the month of October 2026. I click on the arrow to move to Novemebr or September nothing happens. I can not enter new reminders in any date due to no dates appear. In the centre and to the right. I have a white screen. No dates. My calendar is set for Weekly. At the top menu bar i see "events in Next 7 days" and the menu bar shows "Title Start End Category" below this menu bar is a white screen. What have I done to create this situation ans what do I do to fix it (get my weekly calendat back nd be able to enter reminders).

The ad says AOL on top. then activate your license now with a McAfee Logo, then antivirus software needs your attention. Your credit card has failed update it now. With a Login for AOL. I have uninstalled the app and reinstalled, ran all the antivirus apps I have and still no luck. Should I just uninstall the app and then go into AppData and delete the Thunderbird Folder?

I already have Gmail linked to Thunderbird on Windows but now have a Linux computer. When adding Gmail, I am taken to Google's website as expected which grants authorization after satisfactorily logging in. I'm sent back to Thunderbird that then displays Authentication failure. There seems to be no way around this despite looking for any Google credentials in saved passwords. Thunderbird has added other mail accounts with no problem. Google will show that my Linux computer is linked but Thunderbird rejects any attempt to sync with Gmail. I'm wondering if there remains any Google data within T'bird that is corrupted that needs to be cleaned out to start over fresh.

The functionality for moving individual folders in a Thunderbird email account to network locations is missing. Similarly, moving the entire mailbox to a network drive does not work correctly. This is needed to free up resources on the local computer. In our case, the 500 GB SSD is occupied by a 350 GB mailbox.

I want to connect Thunderbird to an Office 365 calendar. All of the help files I've found point me to TBSync, but when I try to get that using the Add-ons manager it says that it's not supported in version 159. Is there another approach I can use? Thanks!

I send an email and I get this response as a failed send. Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-a2p-646964.sys.comcast.net ESMTP server not available (396356/173.46.82.217).

I'm not receiving any emails in my Thunderbird inbox, though I'm able to send messages (but they're not being saved to my sent folder). Connection to my server keeps timing out. Also it looks like I accidentally deleted all the messages in my inbox -- no messages are currently showing when I open the inbox. I think I did this by "repairing" the inbox folder.

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 [redacted phone# from community support forum]

[redacted] @gmail.com

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

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.

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.

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.