Thunderbird Community Forum

I am unable to add new contacts in my contact list. It definitely is creating a problem. Why will it not let me add them, please and how do I fix the issue? I did not have this problem until I got a new computer and using Windows 11.

New Laptop. Windows 11. Bitdefender protection. Installed Thunderbird and a first gmail account on new Laptop, all OK. Attempting to instal a second, different gmail account I get the following message from Google:

"400. That’s an error.  The server cannot process the request because it is malformed. It should not be retried. That’s all we know." 

No problem having installing the 2nd gmail account in my internet browser on new laptop after continued failures to instal in Thunderbird. NB I have both gmail accounts previously (and easily) installed and working in Thunderbird on PC, old laptop, phone. Issue does not make sense. Does anyone have a solution please.

Hi,

Since the last update, downloaded on 4 July 2025 to my computer, thunderbird will not download any new emails from my server.

Please assist.

Thanks,

Melissa

I have 7 RSS Feeds installed and working.

The problem is that 5 of them only update when I right click and update manually but the first 2 update normally when I select "Get Messages".

I've checked each feed and they all seem correct in Properties.

Anyone out there have a suggestion or solution?

Any help will be greatly appreciated.

Jim T

I am using MacOS 10.13, Thunderbird 115.15.16ESR: my Hotmail worked until 15 May 2025 and then it would not download new emails. Screenshots are available if you want me to post them. I got an error message: "authentication failure while connecting to server outlook.office365.com". I updated Thunderbird to the latest for my OS: 115.18.0ESR. Still no new emails. I deleted my email account on Thunderbird and tried to reinstate it. Now I get an error message when trying to set up the account: "Unable to log in at server. Probably wrong configuration, username or password." I tested my password by logging into my Microsoft account with it on my browser. I can also login to my email using Firefox, but I want my Thunderbird email client to work again.

The configuration I am using is: I use my normal hotmail password in the password field. I also set up a new App Password with Microsoft and tried that without success. With the 115.18 update there is a new field: Your login. I just put my hotmail email address in here. incoming: outlook.office365.com, port 993, SSL/TLS, Oauth2 
outgoing: smtp.office365.com, port 587, STARTTLS, Oauth2 (I have also tried: smtp-mail.outlook.com)

I enabled 2-step authentication with Microsoft in my Microsoft account more than a year ago. Interestingly, I don't get a prompt on my iPhone Microsoft Authentication App when I select Done when trying to set up the hotmail account on Thunderbird.

Please help. I am desperate, and I have wasted a lot of time on this without success. Cheers

Hi, My Thunderbird email has stopped downloading emails from my server. I click to download emails, get a message saying "downloading 1 of 25" but no progression from here onwards. No messages are downloaded. I have made no changes to the settings and it has been working well for many years. wifi is connected.

Thank you for help to restore this.

Melissa

I sometimes look into a sub-folder under email inbox account (imap) in thunderbird and can see it is just updating. Is there a specific setting where I can keep all folders and sub-folders constantly updated?

Get Google to stop blocking my Thunderbird Account. So many times this happens and I spend hours trying to get emails. At present I am blocked and I need to work on projects. So angry that Google keeps doing this.

Dell tech reinstalled Windows 11, but missing info on my local folders now on 2nd drive. I have iDrive backup of both the drives, need help to find what I need. I'm Tbird supporter monthly and at other times. Sure can use some help as need some financial records that were in local folder files.

Appreciate help to find and restore my Local Folders which held the needed data.

Thanks in advance, Kelly

New computer Ubuntu 24.04 Mate, older Ubuntu 22.04 Cinnamon. Following support transfer directions (open Thunderbird on new PC, close it, paste a copy of older .thunderbird from USB stick to .thunderbird on new, over write), when I open Thunderbird no accounts are shown only the create account screen. I find no update path for older Thunderbird. New PC came with 128 esr but I found a tarball of 115 .18.0, installed it and followed transfer directions with the same results. Seems like the esr version uses a profile ending with esr and ignores my older one. What are my options for transferring 20 years of significant messages? The hard way might be to identify the account specific files in my older profile and copy them into the new esr profile...

Hi there! In one of my two e-mail accounts I manage with Thunderbird via IMAP, the archive options (where I would like to configure that the archived messages go into folders organized by year) are greyed out. See attached screenshot. (In the other account, these options are accessible.) The account in question is a google-based work account; is this related to the inaccessibility of the archiving options? Can this restriction be overcome? Thanks in advance. Tsepati

I am new to Thunderbird and needed help to import my contacts from Outlook. It wasn't easy; I had to reorganize the CSV file to match Thunderbird's format - what a pain. Then I needed to recreate all of my group addresses using Thunderbird's tools. I used some of these newly created group addresses a few weeks ago. Now all of the group addresses exist, but they have no members. What could have happened? And, what should I do to recover their contacts?

Thank you, Stephen Thompson

In the calendar, I copy and paste events to save time filling in details. But I often need to change the start times. When I do so, the event maintains the original duration. I never want this behavior, it is never useful. It's even screwed up my events by changing the end date to the next day. Why is there no option to disable this?

Hello,

Recently I have started to have emails fail to deliver to a certain domain and the message that comes back is

550 DKIM Sender Invalid - envelope rejected.

I am using Thunderbird v128.8.1 esr (64-bit). Extensions installed are: 1. Attachment Saver (Deimios, v.0.2.2) 2. FileLink provider for Send (Teal Dulcet v2.1.1) 3. Remove Duplicate Messages (Eyal Rozenberg v0.6.1)

I have been in communication with this client for several years and not had this problem before. When I send email to the same recipients using WebMail there is no problem, it is only when I send from Thunderbird.

I am not using any encryption type of setup.

Has anyone come across this before? Does anyone know of a solution?

Thanks, Franc.

I have Thunderbird 140 set up in cards view (threaded). Under Row count I can choose 2 rows or 3 rows. But all that choosing 3 rows does is place an empty row below the subject line. I was expecting it to show me the first line of the email content. Can that be configured? Or what else is the third row supposed to display? (other than the star for favorites, which always appears in the lower right corner but hardly needs an entire row by itself)

• After the update launching thunderbird daily, from anywhere, main `.exe` or shortcut links
• It opens a cmd prompt, I am using Windows 10 build=19041, I also use `windows terminal canary`
• I had no issues before the recent update, is there a way to roll back the version? to the previous commit?

an end to sign in windows that just keep asking for information I do not have would be good and that just keep repeating themselves also I seem to have lost all pop3 functionality without any means of recovering or altering anything. this all started when I found I had 13000 plus emails it was impossible to deleat as they just kept reappering on the next visit to email.

This is the screen I get when I follow the instructions from the first denial screen:

400. That’s an error.

The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

the last time I received an email update on my desktop PC (Win 7 Pro) was 4:08PM (yes, PM) for one account and 4:44AM (yes, AM) for the other account. On my phone, the 4:08PM is the same but the other email account recd an update at 3:17PM.

I have used Thunderbird for many years and have a direct debit set to make a payment each month. Everything on Thunderbird is ok but I cannot write a new email message. The is a little envelope top left that seems to have a padlock on. HELP!