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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.

Yandex email account. Messages are constantly being received: “Alert from account [redacted]@yandex.ru: UID fetch message 5 uid 122: failure due to backend error”. The numbers are always different. Emails are being received and sent. The server settings — the ones recommended by Yandex — are configured correctly. But these notifications appear almost every second. What is the problem?

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

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?

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).

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.

Hi,

For both servers imap.exmail.qq.com / imap.263.net, when I click on the email subject in the email list during downloading processes (many emails headers are being downloaded but email body downloading is not completed), the email is broken without any content (only header).

I go to the web email server and move the email to another folder and then move it back to inbox. Then I delete the same email in Thunderbird and donwload again the email again, it's completely downloaded with the email body.

I don't have any issue with eM client or Outlook for such issues. Any possible setting to solve this issue?

Thanks.

When I attempt to send an email in Thunderbird I get an extensive string of gibberish that I have to delete before I can send the email. What can I do to get rid of this huge irritation? Thanks

My local Thunderbird program (159.0 (64-bit) on Windows 11) is set to auto-install updates. Upon the update completing earlier today, the inbox and other folders were completely empty. They remain so following a program & computer restart, and also opening the program in troubleshooting mode. I have checked the following: - logging into the online mailbox directly works, and shows all emails - sending a new incoming email to the email address does have the email show up in the remote mailbox but not the local mailbox - sending a new outgoing email from Thunderbird does appear in the local Sent folder, as well as on the receiving email account - the local Thunderbird instance is still able to connect to the IMAP Mail Server (mail.talktalk.net) - the following settings are configured, and I believe haven't changed since prior to the update:

 - Check for new messages at startup is **enabled**
 - Check for new messages every 10 minutes is **enabled**
 - Clean up (Expunge) Inbox on Exit is **disabled**
 - Synchronization & Storage: Keep messages in all folders for this account on this computer is **enabled**
 - Synchronize all messages locally regardless of age is **enabled**

I have ~100gb of space available on my hard drive

I'm not sure what other settings might be helpful. Please let me know if there's anything else I should add.

My issue has two parts. The first is that I want new emails to appear in my local email client upon arriving, as they did previously. The second is that I want to have the full set of emails on my remote account available locally, which is currently no longer the case. There is also no sync activity happening, and apart from establishing the initial connection to the mail server I can't see any activity in the bottom left corner.

For a few weeks now we have been unable to send emails through tbaytel server via Thunderbird. We get SMTP error. This happened after recent upgrades to Mozilla. Any idea when a fix will be out?

My e-mail stopped working a week ago. I get as far as "connecting to IMAP but then get a "Login to server imap.orange.fr with username [redacted]@orange.fr failed" message. I have changed the IMAP and SMTP passwords several times but none seems to work. What am I doing wrong?

On MS Win11, my TBird IMAP client (up to date) has two mail accounts. In one, deleted messages return immediately after deletion! Also, (possibly related), this account has TWO Spam folders (I did not do this). The other mail account's messages stay deleted and has only one Spam folder. I ran the re build tool on the first one without success. I am NOT technical, but have donated several times to TBird (I love it)

The instructions at http://mzl.la/1ApHx1w did not help. FYI: I have TWO "Spam" folders?!?! Could this be the problem?

The STAT command did not succeed. Error getting message number and sizes. Mail server pop.gmail.com responded: [SYS/PERM] Your account is not enabled for POP access. Please visit your Gmail settings page and enable your account for POP access.

I have swapped my Internet provider fro Inmotion to Bluehost. When the DNS was changed I can no longer receive emails. I am using Thunderbird. Where do I go to change this? I have a lot of emails that I need to keep. I have them on my computer but cannot receive any new email.

Hallo,

ich bitte um Hilfe, seit dem letzten Update von Thunderbird auf 159.0 (64-Bit) sind meine Mailaccounts verschwunden. Eins konnte ich wieder einrichten, das von T-Online bringt als Fehler ständig "Fehler bei der Authentifizierung" obwohl alles korrekt ist. Thunderbird kann sich automatisch die Serverdaten für IMAP holen, aber sobald ich das Passwort eingebe kommt der Fehler. Das Passwort habe ich jetzt bereits geändert, dennoch funktioniert es nicht. Was kann ich tun?