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My Thunderbird account is reciving, but won't send I have changed nothing ( BUT - I noted a firefox update just now - has this caused the glitch? ) How do I get "SEND" back on my emai, please?

Good day Thunderbirds

I seem to have done something rather disastrous. This morning when starting up my inbox is empty and though i have sent test messages from other mail platforms and they arrive in my Gmail account they are not downloaded to my Thunderbird. I did change the Gmail conversation option, because i want each mail to be separated. The combining of all related mail confuses me. I have reset the option but nothing has changed. All the other folders are intact and if i open "All Mail" every message is still there including the added test messages. Can anybody figure out what i have done and help me restore my Inbox? What if i re-install Thunderbird or something like that?

Here's hoping. I really do not want to access my mail online via Firefox. Thunderbird is my only way of managing 158.0mail.

When I attempt to write or forward an email, the send option is grayed out and I can not send. But I can reply to an email and the send icon is active. Could this have something to do with the fact that I have had a substantial number of emails and I have used thunderbird for many years causing a pointer to flip? If so is there a way to fix this?

Details: Write/forward email send disabled, reply email works fine. Thunderbird for Linux Mint mint-001 - 1.0 153.4.0esr (64-bit). Linux Mint 22.1

Thunderbird has been receiving emails on my PC from Bell Sympatico for years, then suddenly stopped in July 2026 without my changing any settings, and I have to go to the Bell server instead.

Thunderbird 158.1 – Outlook.com SMTP OAuth2 authentication failure

I am using Mozilla Thunderbird 158.1 (64-bit) on Windows 11.

I recently created a new Outlook.com email account, kim.bailey69@outlook.com, alongside my existing Hotmail and ntlworld.com accounts.

The problem

Thunderbird successfully receives emails from my new Outlook.com account using IMAP and OAuth2, but cannot send emails from it.

The error messages are:

"Login to server smtp-mail.outlook.com with username kim.bailey69@outlook.com failed."

"Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) smtp-mail.outlook.com."

SMTP configuration

Server: smtp-mail.outlook.com

Port: 587

Connection security: STARTTLS

Authentication method: OAuth2

Username: kim.bailey69@outlook.com

Troubleshooting already completed

Verified all incoming and outgoing server settings.

Confirmed IMAP works and messages arrive successfully.

Confirmed sending from Outlook.com webmail works.

Confirmed my existing Hotmail account sends successfully through Thunderbird.

Tried smtp.office365.com as an alternative SMTP server, without success.

Created a completely new SMTP server entry and assigned it to the Outlook.com account. The same error occurred.

Deleted and recreated Thunderbird's saved Microsoft OAuth2 authentication token.

Checked Microsoft's authorised applications page. Thunderbird has explicit permission to send emails, and Microsoft confirms it was used today.

Checked Microsoft's recent account activity, which showed no unsuccessful sign-ins.

Verified with PowerShell that TCP connections to both SMTP servers on port 587 succeed.

Checked that cookies are enabled in Thunderbird.

Attempted SMTP diagnostic logging using MOZ_LOG with SMTP and SMTPClient modules, but the resulting log files remained empty.

When sending fails, Thunderbird immediately displays the authentication error without opening a new Microsoft sign-in window.

My question

Why does Thunderbird successfully authenticate to Outlook.com for incoming IMAP mail but fail SMTP OAuth2 authentication, despite Microsoft granting permission to send?

Is this a known Thunderbird issue, and what specific diagnostic or corrective action would you recommend that has not already been tried?

I would prefer to resolve this without deleting or recreating my existing email accounts, as they contain many years of messages.

I have now the version 158.01 (64-bit) with Windows 11. My Gmail account only dowloads email like once a day. The server settings are: -Check for new messages at startup -Check for new messages every 10 minutes This started a few days ago, while I had the version 158.00. I have many accounts on Thunderbird, and re-installing all of them would be time consuming. Any suggestion?

I can't receive or send emails for the address [redacted] @orange.fr with thunderbird. I get the message: Login to server impa.orange.fr failed - retry - enter new password - cancel

If I use Ctrl+E to resend an email it loses all images (both in signature and any attached).

Thunderbird: 158.0.1 (64-bit)

Was working fine before. Stopped recently. If I send a new email, or forward an email, all works fine. Only if I Ctrl+E

Thank you kindly

Dear Support Team / Mail Administrator, I am requesting urgent assistance to force-stop an email forwarding loop and mitigate server load caused by a misconfigured filter in Thunderbird. • Affected Account: [redacted]@leadit.co.kr

[What Happened] I accidentally set up and manually executed ("Run Now") the following two rules under the Tools > Message Filters menu in Thunderbird: • Rule 1: Forward all incoming emails to an external email address. • Rule 2: Copy/Move all outgoing emails back to my Inbox.

[Current Issue & Loop Mechanism] Although I have already disabled these filters in Thunderbird, a massive infinite loop is currently running on the server: 1. When a mail is forwarded externally (Rule 1), it is recognized as a sent email. 2. This sent email is then copied back to my Inbox (Rule 2). 3. The new email in the Inbox triggers the external forward again (Rule 1), creating an endless loop. The external email address is continuously flooded with forwarded messages, and I am highly concerned about local storage capacity issues and overall mail server overload.

[Requested Actions] Could you please urgently take the following administrative actions on the mail server? 1. Force-stop/kill any active mail processing or rules related to [redacted]@leadit.co.kr. 2. Clear the outbound mail queue for this account to stop further external forwarding. Thank you for your immediate and urgent attention to this matter.

- Thunderbird 158.0.1 on Mac. - Three Yahoo accounts: one sends successfully; two fail. - Sending and receiving work through Yahoo’s website and my iPhone. - Error: 550 Invalid mail from. - The error persists in Troubleshoot Mode, and the log doesn’t show the sender address. This happened after latest update Thank you

Hello,

I cannot send email from my personal Outlook.de account in Thunderbird, although receiving email works. Sending email from the same account through Outlook.com in a web browser also works.

This is a personal Microsoft account, not a business or school account. I do not have access to an Exchange Online or Microsoft 365 administration console.

Environment: - Thunderbird version: 158.0.1 (the version reported when troubleshooting started) - Operating system: Windows 11 - Email provider: Outlook.com / Outlook.de

Outgoing server settings: - Server: smtp-mail.outlook.com - Port: 587 - Connection security: STARTTLS - Authentication method: OAuth2 - Username: full Outlook.de email address

OAuth2 was already configured before the problem was investigated.

When I try to send an email, Thunderbird displays an authentication failure. A Microsoft sign-in page briefly opens and closes, after which the same error appears again.

The Thunderbird Error Console reports:

mailnews.smtp: Command failed: 535 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox.

It also shows:

currentAction=_actionAUTH_XOAUTH2

A second entry reports:

mailnews.smtp: Authentication failed: Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox.

Troubleshooting already performed: 1. Verified the SMTP server, port, STARTTLS, OAuth2 and username. 2. Removed the saved Microsoft/Outlook authentication entries for this account. 3. Completely closed and restarted Thunderbird, then retried authentication and sending. 4. Checked the cookie exceptions list: no exceptions were present. 5. Confirmed that sending through Outlook.com in a browser works.

Removing the saved authentication entries and signing in again did not resolve the issue.

My questions: - Is this a known issue with personal Outlook.com/Outlook.de accounts? - Is there any supported Thunderbird-side fix for this specific server response? - Is a different supported account connection method available for this personal account that does not depend on SMTP AUTH? - If Microsoft must change something on the server side, what exactly should I ask Microsoft Support to investigate?

I have found Microsoft's documentation about enabling SMTP AUTH in Exchange Online, but its administrator instructions do not apply to my personal Outlook.de account.

I can provide a screenshot of the Thunderbird Error Console.

Thank you for your help.

I have three computers. I use Thunderbird on all three, but on only one, which I will refer to as 1, do I have access to my email account that comes through a Microsoft server (I have two other accounts and have no problems with them). I use Owl on 1 and used its predecessor for many years. I have recently tried to set up that same account on the other two computers. After setting it up via the Thunderbird method, it gets new mail and I can view all the old messages on the server. It does not, however, access any sent messages nor can I send message through it. I have set the outgoing server to the same settings on 1 to no avail. Computer 1 is on a university campus, which is where that account originates, but the other two are in my house. I have to sign in when starting computer 1 but not the other two. Computer 1 is running Windows 10; the other two, 11. I just upgraded both the home computers to Thunderbird 158. What am I doing wrong? Do I need Owl?

When I access my email on my computer using Thunderbird, I have it set to downloaded the emails locally and remove from the server. Starting today, WHEN I access my email using Thunderbird in my phone, all the messages are still there, and I have to manually delete them, and they still stay on my computer email app. I need Thunderbird on Android to start removing them again once I clear the server.

Hi

"I am being asked daily for my pop3 password

Login to server pop3.tpg.com.au with username ##### failed. retry, enter new password, cancel"

Each time I enter the password and my mail rolls through. I have the password saved using the password manager and I can see that the correct password is saved.

What do I do to stop this happening each day? This has only been happening since the last windows update so maybe a clue there

Any assistance will be very much appreciated

Current Thunderbird setup: Computer: Pop3 Phone IMAP

Until last week, I could leave the emails on my phone all day until I accessed them on the POP3 setup on my computer. That would remove the emails on the server and when I went back to my phone, it would show an empty inbox. Now, the emails do not clear out of my inbox on the phone, and I have to delete them manually. This happens on both the production version and the Beta version. Also, accessing via webmail, the inbox will be empty after accessing email on my computer.