Diễn đàn hỗ trợ Thunderbird

I can't send any emails with my personal outlook account. It always says "Login to server smtp.office365.com with username xxx@outlook.com failed." Receiving mails works fine. Both my IMAP and SMTP authentication are set to OAuth2.

Here's my account info found in troubleshooting information.

   account14:
     INCOMING: account14, , (imap) outlook.office365.com:993, 3, 10
     OUTGOING: , SMTP.office365.com:587, 2, 10, true

I've tried:

• Removing and re-adding the account
• Deleting oauth2.issuer and oauth2.scope in config editor and re-login
• Adding the account in a new profile
• Switching to basic authentication for SMTP

They don't solve the issue.

Når jeg laver en videresend af en mail, bliver de tekniske data vedrørende den videresend mail vis i den nye mail. Se vedhæftet screen shot. Inden jeg installerede den seneste opdatering skete det samme ved: svar mail, videresend mail, print mail. Efter opdatering at Version 140.0.1 | Released July 9, 2025, har jeg ind til nu kun konstateret at fejlen kun findes ved videresend. Mvh Michail

Hi everybody,

Thunderbird is not download mail to the client inbox. I created the mailsadress today, freshly installed TB too. I set up the outlook.com account in TB and TB is establishing a connection with the mailserver, but not loading the mails. every time it tries to connect I can see TBgoing through the motions in status in the bottom left. There are mails in the accounts inbox,TB is just not downloading them. I also tried sending mails a mail to myself, from within TB, works fine. The mail sent via TB arrived in the acount inbox, visible in the webapp.

Please help, THX

already double checked Server Settings:

   IMAP:
       Incoming Server: outlook.office365.com
       Port: 993
       Security: SSL/TLS
       Authentication: OAuth2
   SMTP:
       Outgoing Server: smtp.office365.com
       Port: 587
       Security: STARTTLS
       Authentication: OAuth2

Every now and then a folder flag will change to the drafts flag/icon, it seems to be a random occurrence which can happen to any sub-folder. Up until the most recent Thunderbird upgrade I had a working extension called FolderFlags which allowed me to go into the Folder properties and change it back but that extension no longer works with the latest version of Thunderbird and there is no alternative extension. How do I change the flag back to it showing as an ordinary sub-folder in my Inbox instead of Drafts? As an interim measure I've created a new sub-folder and copied the emails from the old into the new but that's not ideal at all. I hope somebody will create an updated extension but has anyone any other suggestions please?

As soon as I open Thunderbird, the program freezes before I can click on anything. The password prompt box appears, but regardless of whether I click “Cancel” or try to enter the password, the program freezes and only displays “No response.” I am unable to click on any menu item, as the program freezes even then. I wanted to repair it via Windows, but only the “Uninstall” tab appears in the Control Panel, not “Repair”... It doesn't matter whether I start Thunderbird in safe mode or normal mode. The problem is the same. Version: Thunderbird x64 de 140.0.1 Does anyone have any idea how I can access my emails, which I urgently need? Many thanks! Ekki

Translated with DeepL.com (free version)

This morning I opened Thunderbird and a Google Calendar reminder popped up. I clicked 'Dismiss' but the reminder did not disappear. I tried clicking the X close button but the reminder did not disappear.

The problem is that this prevents all access Thunderbird. Nothing is selectable so I have no access to my emails or to any of the Thunderbird settings.

I tried reinstalling Thunderbird (without deleting my profile) and the Google Calendar reminder pops up again.

So I am really stuck!

Can anyone help solve this issue please.

Hi I have a company email account with a large amount of emails accessible from several computers. I created a local folder in Thunderbird on my NAS drive and directed the locations to it on my computers. I have emails sorted by year, as well as received and sent. When I open the program, I can see the email subject, recipient, and date. However, I can't open any of the messages; both the quick preview and the separate window show a white background. What's the problem?

Hello Mozilla,

I have used Thunderbird for a long time but recently my contact with eBay has worked but i cannot access any choices they give me. Access with Chrome is great but I prefer Thunderbird so can someone please sort this problem.

Regards

Gordon

Hi, I have been using Thunderbird for many years. I have not made any changes to the standard Windows 10 version.

Suddenly, when I want to open a New Message, the button is highlighted in blue but nothing happens when I click on it.

Windows 11, Thunderbird 140, How to increase the"New Event" box and its Font

- Windows 10, the size is OK

- I have 'Googled" this problem and there seems to be no answer.

Kind regards: Gary Shaw

Ciao :)

I used to use these add-ons

Old Icon Phoenity Buttons Phoenity Icons

to make Thunderbird more attractive, but now I'm having constant problems. The interface has become schizophrenic, and every time I open it, the icons have a different style, so I've been forced to disable the add-ons.

The question is, are there any supported add-ons left? I can't find any on the website. :(

Could you please add the columns "triggered number" and\or "last triggered" to Message Filters > Rules > Match? This would good, for example, to determine which email filters are still useful (so old ones could be removed).

Also, the fields conditions really need a sort or "find duplicate" options to avoid bloating the list with copies.

Thank you

In the Settings > Local > Disc Space I have selected: Delete messages more than 61 days old.

In the Local > Trash > [right click] > Properties > Retention Policy, I have also specified: Delete messages more than 61 days old.

Why are the messages deleted from the Trash when I close TB?

I use TypeApp on my android phone. If I install Thunderbird (which I have been using for years on my PC--love it, but unrelated to this question) on my phone, can I import everything from TypeApp into Thunderbird mobile and quit TypeApp?

Thanks in advance.

Jon

Hi: I need to import my data shown here: C:\Users\DonB\AppData\Roaming\Betterbird\t70e12zz.default\Mail\pop-mail.outlook.com so I see all my email and its folder structure.

I think Outlook.com became: outlook365.com?

Where do I change this stuff so it works?

My Profile archive: https://1drv.ms/u/c/f1c69e25e0d2390a/EYrCbhynjyhGptVQ-P5ZWGUBDJFeXZno-JwoGDWXauj_9Q?e=gK0kOL

Thanks, mozillafan

Failure to download email from Optus. I have spent a number oif hours to no avail talking and typing with the Optus staff regarding this problem. 1. I can send email from TB but cannot receive. 2. I can see the incoming emails in their Webmail site. 3. Optus confirm my settings are correct for both the mail server and SMTP server. When I go to Settings> Security > Passwords > remove server so I can re-submit my password, the only one showing is the SMTP server. Should the incoming mail server also be shown?

I am frustrated and ready to dump TB but have bee with it many years and don't want to start again with another programme as I am 83 and am partially blind. Please can anyone assist?