Thunderbird Support Forum

I have a recurring but random problem when I reply to an email with a distribution list. TB seems to select an email address from the CC addresses on the original email rather than my mailbox address. example - mail received from user A with copy to B C D E. I reply to all and sometimes the sender address used by the system is one of the CC addresses (ie B C D or E). All users are getting the message but they think it was sent by somebody else. This could be a sensitive problem if I was making a report and then wondered why there was no follow up. Is there a setting somewhere that decides which sender address I use? I use two accounts, one is my internet provider (BT) and the other is Gmail. So far, I have only been advised of Gmail errors. Thanks in advance.

Since Thunderbird updated to 115.11.1 (64-bit), , the DEL key no longer deletes messages from within the message window. It DOES still delete the messages from within the message list. Any ideas as to why?

I set up a new Windows 11 PC (64-bit) about 2 months ago, and installed Thunderbird Supernova. I allowed MTS to choose all the settings and everything was working fine until about 3 weeks ago I am now running version 115.11.1 (64-bit). I noticed that many messages I recieve at scheduled times every day were not appearing in my MTS message list until sevveral hours (a few actually took 3 days) after their normal delivery times. Checking with the senders revealed no change to the time they were sent. Looking at the messages when they appeared showed that they WERE received on time. Logging into the web interfaces for Gmail and Comcast/XFINITY email revealed that the messages were arriving on time. The only logical conclusion is that MTS has a problem in its IMAP protocol implementation that does not recognize new/unread messages as such, and therefore does not retrieve them. I am legally blind, and up to this point, mTS is the only fully accessible, easy-to-keyboard-navigate email program.

A bit of an odd request, I know, but I'm trying to send encrypted email from Thunderbird such that only the recipient, and not the sender (me) can access the message once it has been sent. I direct Thunderbird not to save a copy in the "Sent" folder when I do this, but Thunderbird still encrypts the message such that my personal key can decrypt it. Is it possible to send a message that can only be decrypted with one key? I have access to the recipient's private key, if that helps.

Thunderbird has suddenly stopped pulling in email, please help. It just says 'Checking mail server capabilities'. I have changed no settings at all. Webmail works. Email on my phone works. So it's not the ISP or the server or anything like that. It's just on Thunderbird where I can't do anything, but I've not changed anything so I don't understand.

When I try to send email it fails and says: Sending of the message failed. Unable to communicate securely with peer: requested domain name does not match the server’s certificate. The configuration related to mail.mandyhaggith.net must be corrected.

So please can you tell me how to correct the configuration?

Thank you for any help you can offer.

Best wishes Mandy

Very soon after startup it begins to stutter with the spinning beachball of unresponsiveness. At first it will spin, then come back for a few seconds, then spin again. Eventually the whole app is unresponsive.

The troubleshooting steps I see on here all start with "Go to [some location in the menu]". I can't do anything with anything in Thunderbird. I can force it to quit and start it up again, that's about it.

It is also always asking me for the passwords of some of my IMAP accounts. These are big accounts, some folders have several hundred thousand emails. The Inboxes are smaller, maybe a couple hundred in total at the moment. The last configuration I was able to make put it into Unified mode.

The damn thing is that after having been useless like this ever since I installed it, last week it started to work fine. Stayed that way for several days. Eventually that failed, though, and my whole Mac ended up locked up the way the app is, I had to manually power it off.

I don't know if it writes any info about what it's doing to a log file somewhere, I am not having much luck trying to find any information here. Just other people with similar problems but no substantive replies.

Using Thunderbird on an older Mac laptop, running macOS Monterey 12.7.5.

I was setting up my new email account on thunderbird and I was facing some issue, so to solve the issue I set up the account without entering the password, but later when TB is asking for the password and I am entering the password then TB is not accepting it, it is only showing that "Login to server imap.gmail.com with username 23je0520@iitism.ac.in failed".

please fix this problem.

Hi,

I am running Thunderbird 115.10.1 (Flatpak) on Ubuntu 20.04. (no extensions except birdtray) I have 4 email addresses added to my TB, and I like to see all of them together, therefore I am using Unified Folders. When I am accessing Unified Inbox, TB is very slow and basically frozen until it loads this folder (often a pop-up appears that 'TB is not responding'). it takes between 30-60 seconds to load my emails (either on start-up, or clicking on another folder, then going back to Unified Inbox). Every other folders open almost instantly. I have to admit I have a lot of emails in the Unified Inbox (~20K), however the inbox of my main email has 18K, and accessing that folder separately is instant. So any operation, other than opening Unified Inbox, is quite snappy.

This issue persists since I upgraded to v115, even when I did an OS reinstall (also tried installing apt (v115.11.0)).

I have seen this answer: https://support.mozilla.org/en-US/questions/1428374#question-reply however, nothing changed by resetting the folder.

On startup TB pops an error box up saying ' There is no email program associated to perform this action'. When dismissed TB continues to open normally. No other errors seen during operation.

I have checked my Win 10 Control Panel Apps options. TB is the email default. MailTo, file type .eml and all other settings I can see are set to TB as well.

I have tried nearly everything on all the forums and help sites to no avail. I still get the error message that my message cannot be sent. Most of the time I get the server response as [C20]: message blocked. I have triple-checked my SMTP server settings and password, uninstalled TB and re-installed. TB seems to have recently changed the profile in use, so it no longer has all the files in Mail\Local Folders it used to have. I'm thinking I need to create a new profile but I don't know how to do that.

I have two identical instances of the Thunderbird 115.11.0 (64-bit) installed on Fedora 40 (two different boxes) They display Email preview differently (See attached pictures)

Anybody knows how to change that view? What settings?

I had a problem where emails from two months ago were empty meaning that when I click to open them, they contain nothing. I tried using the Repair Folder tool. Now, almost all of the emails in my inbox have been deleted. Unfortunately, I did not back up the folder. Any way to get these back? Is this expected action when using the Repair Folder tool?

Thank you