All Products Community Forum

I have been using Mozilla Thunderbird for decades and they have even contributed a small amount of money to Thunderbird periodically. Just within the last two or three days all of a sudden I have been unable to send emails with my phone. I receive emails, but I do not send them.

So I opened up a laptop where I did not have Thunderbird and set it up properly through Spectrum using the incoming and outgoing servers as mail.twc.com. and yes, just like on my phone. I continue to receive new emails, but even with the laptop I was unable to send an email.

I received the message"send message error sending a message failed. The message could not be sent because the connection to outgoing server smtp mail.twc.com was lost in the middle of the transaction. Try again."

I contacted Spectrum twice and both times they had me try to send a message through their Web server spectrum.net and that message did go through. Of course then their response is that this has to be a problem with the third-party app meaning Mozilla Thunderbird, and they can’t help with that at all. I sure would appreciate some help because I hate to walk away from Thunderbird as well as change my email address after all of these decades.

The File (saving to a folder) Recent function used to have the folders alphabetically. Some genius thought to reorganize the Recent folders to be in chronological order. Is there a setting to have the Recent folders be in alphabetical order again? I could not find anything. Thanks in advance.

I have used version 145 of Thunderbird "all my life". Until the other day when I installed version 146. I realize of course that development changes things, but I would like to inform you that a 93-year-old has neither the patience, energy or interest in learning the new Thunderbird. I therefore wish that someone would be so kind and send me the installation file for the previous version. (Unfortunately, my own one is in a computer that I no longer own.) Furthermore, I donated 194 SEK on December 26th when I downloaded the program. (And it wasn't the first time.) In summary: I would like to get the installation file for the previous version (for Win11, 64 bit). Best regards Hans Peter Wiehen

Three weeks ago I attempted to migrate my TB profiles from a 2014 mini-mac to a 2024 mini-mac. I thought I did a better job of backing up my profile using CCC than I actually did. In the migration to the new Mac I lost all my subfolders from the last 20 years. Apple created a new Profile and 2 restoration Profiles on the new Sequoia based mini-mac. I wasn't familiar with these and panicked. I copied those files, took them back to the original mac and tried to follow Toad-Hall's method of restoring the subfolders recommended to bmack1 on 23/11/22. However, I failed to carry out the step of going up two levels in the path of the Library to copy the entire "Thunderbird" file and only copied the Largest restoration file. This in turn, "contaminated" the 2014 original Thunderbird mail profile and only an Inbox and Trash subfolder remained. Today, after 3 weeks of searching and reading the generous contributions of this community, I came across a post explaining that the "sbd files" will show the subfolder headings I created in the original sought after Profile. And I found it!!! My problem is I have re-read Toad-Hall's method of re-installing the original Profile and tried to carry that out to the letter by placing the old Profile within a Thunderbird folder and switching it with the current one. But it's still listed as the "Restoration qqg...file" and probably shouldn't be, but I don't want to go any further and risk losing it because I feel I almost have it. So any guidance would be greatly appreciated. Thank You.

I am using Thunderbird with IMAP accounts and the Swedish language pack. My Inbox is correctly displayed as "Inkorgen", but other system folders like "Drafts" still show their English names instead of the Swedish ones (e.g. "Utkast").

In the folder properties dialog, it looks like there is a field for the display name separate from the server path, but I cannot edit it for system folders. For custom folders I can rename them, but not for Drafts, Sent, or Trash.

Is there a way to change only the display name of these system folders without altering the IMAP path? Or is this a limitation in Thunderbird's localization/mapping?

When I let thunderbird compress the inbox and other folders, the not read flags on all new emails get reset as if I have read all of the new emails. Compressing the inbox and other folders should have no effect on the flags showing a message has not yet been read. That only makes sense. The not read flags getting reset started happening several versions before 145.

I think I understand the difference between "folders" and Gmail "labels". So, I'm curious. When Thunderbird synchronizes with Gmail, does it create local physical folders for each of the Gmail labels in use, or does it use the Gmail label scheme locally? If a message in Gmail has two different labels attached to it, are there actually two copies of the message created locally in separate folders or not?

For over 1 week now I am finding that T-Bird freezes or locks after I have opened several messages. Leaves me unable to read or delete messages and unable to close down T-bird

With thunderbird version 140.4.0esr (64-Bit) on Linux functions to print e-mails or pdf documents is no longer working. When trying to print an email or a pdf document thunderbird starts looping and you need to stop thunderbird from outside with a kill command.

I have an existing Tbird account for my Gmail emails. Have set up a new Tbird account for my Outlook email account. Would like to move all emails, including folders and subfolders, to my new Outlook Tbird account (with the intent of closing my Gmail account altogether).

Would appreciate learning the steps to ensure the emails, folders, and subfolders are moved from Tbird Gmail account to Tbird Outlook account

Hi, am not finding anything helpful in the support area, so hoping someone can help me solve. When a calendar reminder pops up, and I try to snooze or dismiss, I get this message:

Status Code: 2,147,500,037, null

Server Replied with 400 If you’re seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add or edit events for, you can mark this calendar as read-only to avoid such experience in future. To do so, get to the calendar properties by right-clicking on this calendar in the list in the calendar or task view.

Thing is, I do want to add and edit events, so I have no other options and the reminder keeps popping up every couple of minutes it seems. Any help resolving is appreciated. Thx!

My checking account was just billed for another month of Thunderbird. To the best of my ability, I have already requested that my subscription be cancelled. I use Tuta. Please cancel my subscription/billing. Many Thanks, Ron Axelson [edited email from community support forum] @tuta.com

Would like to see these enhancements made to Thunderbird:

1. Add recipient email address to view. This could be added next to the sender email address, separated by something like a pipe character "|" and identified by "From: ", "F: ", "Sender: ", or "S: " in front of the sender address and "To: ", "T: ", "Recipient: ", or "R: " in front of the recipient address
2. Add search filter terms to search capability. Some example filter terms would be 1) "mailed-to:" or "recipient" to search for emails sent to a specific email address or domain (using wildcard), 2) "mailed-from" or "sender" to search for emails sent from a specific email address or domain (using wildcard).

I am trying to create filters for all the spam I have been receiving. It mentioned a tools menu for adding additional filters, but I am not seeing a tools menu anywhere,

I cannot set up my icloud email in Thunderbird.

Error implies that the password is incorrect but i know it's correct, i am able to sign in to webmail using it just to prove a point.

"Unable to log in at server. Probably wrong configuration, username or password"

I have verified server info on apple support and verified username and password is what i use on all other devices. Username and password also works on MS outlook.

I'm dealing with a properly updated 'bird: 140.5.0 (32-bit) running on an equally updated Windows 10 desktop. First thing this morning, out of nowhere, I started getting an "unable to write the email to the mailbox..." message when sending, thus I could send but not save. And then I realized I wasn't receiving either, on all three accounts in my Thunderbird. I stopped everything and focused on trying to fix this. It's been an all-day, losing effort. So far.

I tried the various quick checks and fixes recommended here and there: I'm running the program as an administrator. I restarted the program. I rebooted the computer. I think I have enough disk space, but to be sure I deleted some bloat from possibly overly large files. I compacted, even though the program is configured to do that regularly. I temporarily disabled my antivirus program. I went into my webmail and deleted all messages that have arrived since my Thunderbird stopped receiving, in case one of them was corrupted. And probably some other attempts as well. Nothing has helped.

And now a second, even worse issue has fallen from the sky. Thunderbird opens. The folder list is where it always has been. The number of unopened messages in each folder is there in boldface, as always, but...the folders are all blank and I get the dreaded popup: "unable to open the summary file...." Have I lost my years' worth of carefully curated emails?

I've tried folder repair. I've deleted parent.lock. Etc. Nothing. Nothing. Nothing.

I will be super-grateful for any wisdom sent my way.

I downloaded Thunderbird and added my email account. The email account I configured in Thunderbird is set to be permanently deleted. All information in the email account will be deleted. My question is whether I can use Thunderbird as an email archive? I think I copied all of the emails in the account into Thunderbird. When my email account is deleted will the copied emails in Thunderbird still be there or will they disappear as well?

I copy/paste emails a lot for my job, which needs to include from, sent, to, cc, bcc, and subject:

From: Sender <sender@email.com>; Sent: Wednesday, January 21, 2026 at 11:27 AM EST To: John Doe <johndoe@email.com>; Cc: Jane Doe <janedoe@email.com>; Bcc: Subject: Email Subject

Currently, I am using the plugin ReplyWithHeader, which will produce this style of header on reply/forward, but is there a way to display this in the email body on view, without me having to reply/forward to produce the headers in the email body?

Is there an easier way to block unwante senders than the extra effort to create a filter ? It seems there should be an easy way to "Choose or Apply a Block to a specific email sender by simply clicking on a "BLOCK" link to prevent that sender from sending unwanted emails(not just that email)