Thunderbird Community Forum

Updating to the most recent [159.0 (64-bit)] update zapped my email account (gmail) settings. No, I haven't tried troubleshoot yet or re-entering all my IMAP settings. :) (I will when I can shoehorn the time.) My installation (64-bit) on the appropriate Windows version has had no problems for years, & updates have worked consistently (through both ap & OS updates, until this specific update.

My question right now is, has anyone else run into problems with this issue? I know it's not that much to go on, but I'm in a hurry & need to see if anyone else has experienced it.

TIA for any/all info. :)

Bill N.

I've been using Thunderbird happily for many years, but a couple of days ago, it started making problems. It sometimes shows only my mail address, but no folders, so I cannot get to my mails. Sometimes it shows only the folder for incoming mails, but no "sent". Or "sent" ist empty. Sometimes everything works. (I have a second mailaddress in this thunderbird app, for which all folders are present, no problems there)

I can't add my personal @hotmail.com account to Thunderbird. Every attempt ends with "Authentication error – Unable to log in at server. Probably wrong configuration, username or password." All my other accounts (Gmail and several Microsoft 365 business accounts using outlook.office365.com + OAuth2) work fine in the same profile.

Setup

• Thunderbird 160.0 (64-bit) on Windows (problem also happened on 159.0)
• Settings auto-detected by the Account Hub: IMAP outlook.office365.com:993 SSL/TLS OAuth2; SMTP smtp-mail.outlook.com:587 STARTTLS OAuth2
• POP3 (outlook.office365.com:995 SSL/TLS OAuth2) fails in exactly the same way

What happens

• The Microsoft sign-in opens in my default browser, I sign in with the correct account (2FA), and I get the "You're all set" page.
• With mailnews.oauth.loglevel = All, the Error Console shows a successful token response from login.microsoftonline.com with scopes IMAP.AccessAsUser.All, POP.AccessAsUser.All and SMTP.Send, and "Creating new login for ...@hotmail.com". Microsoft also emails me "New app(s) connected to your account".
• Immediately after that, account setup fails with "Unable to log in at server". The console shows nothing more specific.

What I already tried

• Removed and re-added the account several times; cleared the saved OAuth logins for this address
• Cookies are allowed; mailnews.oauth.useExternalBrowser is back to true (setting it to false made the redirect go to https://127.0.0.1 and fail)
• In Outlook.com: IMAP is enabled (toggled off/on and saved). The address is the primary alias of the Microsoft account. Two-step verification is on. Recent activity shows no blocked or unusual sign-ins, even right after a failed attempt.
• Webmail works normally.
• Microsoft support says nothing is blocked on their side and sent me here.

Is there anything else I can check, or a way to see the actual IMAP server response to find out why it rejects the token?

I apologize in advance if I have sent out anything suspicious below. I have a question regarding the Thunderbird-Gmail transfers.

I have read about the article ([[Thunderbird and Gmail|https://support.mozilla.org/en-US/kb/thunderbird-and-gmail]]) regarding data transfers to Thunderbird from Gmail. I was wondering if it's possible to transfer all Gmail data of that email address (i.e. examplename@gmail.com) to the different email address for Thunderbird (i.e. abcde@thunderbird.com), rather than using the same email address that I use for Google's Gmail?

If so, should I follow what's described in the above article link, or is there a different way?

Also, what should I do with the websites that I log in to, such as social media, healthcare, business-related login information, etc. between email addresses from Google's Gmail and Thunderbird? I really don't want to mess anything up on any of my important personal stuff.

Meeting notices are showing locally as being stored in my Google calendar, but actually are not.

I have four email addresses in Thunderbird, say one@domain.com, two@domain.com, three@domain.com, four@domain.com. I get Microsoft meeting calendar invites from time to time at each of these addresses. I accept them.

I want my calendar also on my Android, so have subscribed to my Google calendar, say at address calendar@gmail.com, through the builtin Thunderbird feature of a calendar on the network.

After accepting a Microsoft meeting invite, say at two@domain.com, it shows up correctly in my Thunderbird calendar as being stored in my Google calendar:

  Calendar: calendar@gmail.com

But actually it is not in that calendar when I check the calendar on the web. And so of course are not synced to my Android.

Is the problem that in the calendar properties in Thunderbird that I have my main email address "one@domain.com" selected from the "Email:" dropdown? Should I change that to "calendar@gmail.com"?

If so, does that mean I also need to add "calendar@gmail.com" as an email account to Thunderbird? I have not done so yet, because I don't need email from that account, I am just using it for the calendar feature.

Thanks.

I have just changed my Gmail password and now see this message when I log into TBird

accounts.google.com needs you to confirm access again to keep syncing with your account. Username: X@gmail.com

(PII redacted by moderator)

The past couple of months, sending emails has been difficult. I did all the troubleshooting, such as verifying the network settings, allowing a longer time for connecting, tweaking Avast settings, rebooted the Spectrum modem, etc. It doesn't seem to matter if the email is only text or if it contains graphics or attachments. I have 6 Roadrunner accounts in Thunderbird, and the problem is with all of them. I have automatic updates turned on. Sometimes it takes several tries to get the email sent. Thunderbird is sending some of the "not sent" emails to a local folder, which is hard to get them out of. What am I missing? tnx

I use HTML as my signature. It has been working just find, but lately when people reply to me, their messages were coming in blue text. So today I changed the: Settings > General > Plain Text Messages > Quoted text formatting from blue colour to black (I have no idea how that was set to blue in the first place). that is all I did. Image attached of the change I made.

In any case, after that, when I tried to send a new email my HTML signature no longer displays the correct font (Pristina) but shows only variable text. The HTML file is not corrupt, it still looks fine in the actual file I saved, but, Thunderbird is changing it somehow. Even when I look back at sent files, Thunderbird is showing me the variable text and not Pristina.

Any assistance would be much appreciated. With thanks, NM

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've been having a bit of a nightmare - I was using Google mail - then I migrated to Proton - now I am going back to Google (for now).

I added my email address to Thunderbird and then had to installed Proton Mail Bridge to allow me to download all those emails to Thunderbird. This is apparently 9.5GB worth of email according to Mail Bridge.

Now when I open Thunderbird it keeps crashing, becoming unresponsive. I don't know how to proceed - do I need to sign out of Proton Mail Bridge - or Delete my account in Mail Bridge - or something else.

I can't tell if Thunderbird is busy "compacting folders" or some other task...

I have been in the meantime trying to delete messages from my Proton mail (in my browser) to see if that helps. But I can't tell if this is doing anything beneficial or not.

I literally can't open Thunderbird now without it crashing, despite me not taking any kind of action (just the spinning/loading wheel constantly visible).

Hope this is enough info but happy to share anything else! I have tried restarting the computer too.

Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) mail.twc.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.

I have installed Thunderbird on my MacBook Air (Tahoe 26.4) and synced all my hotmail emails from an account which I wish to delete. Do I need to do anything before deleting the account i.e. will they stay in Thunderbird or is there a setting I need to change first?

Our time zone (Vancouver, Canada) did not revert to Pacific Standard Time. We remained on Pacific Daylight Time. I changed the time on the computer system. However, when I receive emails in Thunderbird, it shows a time of one hour behind (PST) and not the correct time (PDT).

(Webmail does show the correct time.)

How can I change Thunderbird email to the correct time?

I am trying to add an Proton mail account to Thunderbird using the Proton Mail Bridge (PMB). In the PMB guide it is recommended to uncheck Account Hub in the Setting>General. The problem is that the Account Hub still pops up when trying to add a new mail account - it simply refuses to go away regardless of several restarts of both the computer and the mail client!

A timeout in the connection to the server means that I can neither receive nor send emails, even though this had been working until today. I'm working on the latest windows version. How to solve this problem?

Hello, I'm currently having a problem with Thunderbird version 15.9. I can no longer sign in to my Google-Account after I set new passwords and entered them in Thunderbird. Several attempts were unsuccessful. I then deleted all entries related to my Google account. Adding the existing account again failed. I received two error messages. Error message 1: “Waiting for authorization during sign-in". Error message 2: “The inbox server is already in use.” An other E-Mail Account runs perfect. I urgently need help.

Hi everyone,

Why is it not possible in Mozilla Thunderbird to compose a new message within a standard tab in the main window?

Or is Thunderbird designed in such a way that the compose window always opens in a separate, standalone window? There is currently no option within the program's settings to change this behavior to use a tab instead.

Thanks!

dal mio account tizianomorselli@gmail.com sono scomparse le email inviate e ricevute dal 23/04/26 al 23/10/26. Non sono nel cestino non sono nello spam e non sono nell'archivio.

Emails sent and received between 26/04/23 and 26/10/23 have disappeared from my account, tizianomorselli@gmail.com. They are not in the trash, not in the spam folder, and not in the archive.