Thunderbird Community Forum

I am currently running Thunderbird version 128.11.0esr on Windows 11 on a Dell desktop computer.

I have been running Thunderbird for years. But back in February 2025 my previous Dell desktop died, so had to purchase a new Dell desktop running Windows 11. Then I downloaded Thunderbird and installed it on the new desktop then copied over the profiles that fortunately had been backed up just a week prior. It has been working fine. (When I installed the Thunderbird on the new computer I did not realize there was a difference between ESR (Extended Support Release) channel and Release channel; I just downloaded and installed what I came upon.)

However, around 5/28/25 got a pop-up message that stated something to the effect it is recommended I upgrade to Thunderbird Release.

Should I download and install a new Thunderbird from the Release channel? Will the existing profiles work with the Release channel Thunderbird? Thank you for your help.

Hi. I have Thunderbird running on two, different computers. The older computer has many emails I'd like to merge on to the newer computer with Thunderbird.

Does anyone know how to do this? All I've been able to find is a solution that overwrites the emails of one or the other profile folders. I'd like to merge.

Thanks.

• every time I send a msg in Android the msg gets sent but there's duplicate Compose window behind it that has to be closed... using version 10.0 ... please advise - thanks

I have an old Thunderbird account that is no longer active but I have a huge archive of emails that I would like to be able to access. Thunderbird takes up a huge amount of space on my nearly full C drive because of this. Is it possible for me to save the archive on my D (data) drive and just have the program on my C drive. And how can I back them up. Thanks!

I'm currently noticing that images sent to me aren't appearing in Thunderbird Inbox.

I look at messages first in Mailwasher (while they're still on the server) and download the ones I want to keep or read later. I saw an image in one of today's emails while it was in Mailwasher, but when I read it in Thunderbird, the image wasn't there.

Then I noticed a couple of other emails that mention an attachment, there is nothing there.

Previously received photos are still there.

Is there some setting I accidentally made?

Thanks, Kami

About a week and a half ago I experienced an issue with Thunderbird going through file folders and 'randomly' selecting emails to move to the 'Trash' file. At present I have over 1200 messages in 'Trash' with no common denominator for why they were selected. I've never changed my preferences for when or what to delete so it came as a surprise to see this many emails sitting waiting to be manually deleted by me. I'm convinced that the issue must be something in the 'prefs.js' file.

Running TB version: 128.11.0 esr (64-bit) Is the issue tied to version 128.11.0 perhaps?

I have four other TB email client accounts that all work perfectly, except for this one lame duck that really is getting out of hand.

Could probably import and edit the old 'prefs.js' file from a backup of the old email profile, but the number of changes would be significant. File size of the old 'prefs.js' is about 17 Kb's while the newly created one (four days ago) is only 13 Kb's

This client email account is / was very old and has been on the TB update schedule for years. The email address contains upwards of 11,000 emails on the server. There is no server space issue either. The email address is probably more than 10 years old. The other four client email accounts I have are much smaller and less than 4 years old.

Thinking that something in this particular client profile must have gotten clobbered by unknown means, I finally decided to delete the account and set up a new one (losing my address book in the process of course). Fortunately I found an 'abook' in my backups that came close to being up to date.

Now, the new profile has these quirky issues where it won't open the inbox in a window showing the header information that allows one click to open the message immediately below.

Further, the new TB client is constantly downloading and updating folders with old emails from the server each time TB launches, and of course, it adds a few more emails to the 'Trash' file each time. Started at about 700 messages before I decided to delete the client profile and rebuild and now surpasses 1200 in just the last 4 days.

Running out of patience and options.

No matter what I do all I get is this: Login to server imap.gmail.com with username smyn1118 failed. and: Unable to log in to server. Probably wrong configuration, user name or password. Any ideas? ....... Sam

hello I left account A (Google) and I am mainly using account B (Google) now. However, when I search for the mail of account A, it only shows the result, but after clicking it, it shows that there is no mail. How can I recover it? This is because the most important mail is in account A. PLEASE HELP ME....

I get the following error message while saving a send message: "Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors."

This is my local PC, so no network error here. So, it most be a file access errors. How do I fix or resolve this issue?

I'm running on Ubuntu version: 24.04.2 LTS

Thanks,

I get the following message sometimes in my MS Outlook email.

"Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors. You can retry or save the message locally Local Folder/Sent-dwagner@lancorpnet.com.

Network fine, "file access errors"??? It did save it there either. How can I fix this

When I turned on my PC this morning there was a new message that popped-up that I never sent which was very difficult to cancel/close/discard so I rebooted my laptop. When I went back into Thunderbird to create a new message, the entire screen was dark and filled with coding (see screen shot below.) If I click on each element I can delete them and get back to a blank page. Also, it appears, thankfully, I am sending and receiving emails as normal. My email domain is with Go Daddy and I do use Owl so don't know if that has any effect. I would appreciate any help. Thank You!

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

I'm using Thunderbird 128.11.0esr (64-bit) on a Win 10 system, and my email host is DigitalSpace, a Verizon company.

As of this morning, TB no longer gives me a password dialog when I start the app. So, I forced that dialog by sending out a dummy email, and I enter my credentials when asked. Outgoing messages go out without incident.

But even though my password is accepted for SMTP use, the POP incoming function no longer responds to File/Get New Messages for . None of the selections will download any emails.

The banner at the very bottom of the Thunderbird window usually displays a "retrieving emails" message yesterday, as usual. But now this banner is completely blank, nothing happening.

DigitalSpace has given me what they say is the correct POP Server name, and they specify that I should use Port 110. I've attempted to reach the POP server by its name and by its IP4 address, but I see the same fail with both: No response.

Note 1: I'm deleting all cookies at every log-off. Is there any chance that this is affecting TB's performance?

Note 2: Non-Mozilla fix websites have suggested accessing the TB Profile folder, and deleting file global-messages-db.SQLITE . I tried that, but it didn't fix the problem.

==> Can you tell me if there are any additional settings that I need to adjust?

Thanks very much, Bill Bailey Santa Clara, CA

-=0=-

Amazing that there is no topic for Spam, the most hated aspect of email. Mozilla, wake up!

Anyway, I want to be able to highlight a bunch of spam emails, then block all the domains they are being sent from, first checking to make sure nothing was sent from a legit domain like Gmail or Hotmail. Because the smart spammers acquire domains from which they can generate an untold number of email addresses from and they can just a different one every day so blocking an individual email address from someone like this is useless. They'll never use the same one twice because it's so easy to use another one. They own the domain so they control everything at that domain.

I've never heard of any email program offering this which is perplexing as this is the only logical solution to the vast majority of spam we are plagued with in 2025.

We really need an Add-On for Thunderbird as it appears Thunderbird doesn't seem to care.

I recently archived a large number of messages from one of my IMAP accounts. After that, new messages show up as unread headers, but when I click on them, nothing shows up in the preview pane and the status just seems to get stuck on "Loading message". I have done the "Repair Mailbox" thing a couple of times. After a restart, Thunderbird reloads the headers from the server, but I get the same result.