Thunderbird Support Forum

I have been struggling with slowness in Thunderbird in recent months (Windows 11, mid-range Lenovo laptop). There is often a distinct lag during even the smallest operations.

Examples are: selecting an email, closing a tab, typing, calendar events editing.

TB process in Windows usually uses 1000MB RAM. RAM is around 60-70% usage usually. I never have the same slowness issues with other applications.

I tried quite a bit: safe mode testing, removing extensions, compacting folders and more tips. I ended up removing Thunderbird and my profile entirely, and reinstalled the latest version with an empty profile. I just set up my Gmail and other email account. No extensions installed, yet still the same issue.

Could it be that something is still there from a previous install, if I removed my profile?

I've been using Thunderbird in Linux and Windows for years with moderate issues that I was able to resolve, but am now really puzzled. Please help.

Hello, All

I need major help, please.

I am getting the attached messages when trying to send an email. Thunderbird worked perfectly yesterday morning, but then would not send any emails. I get emails, but cannot send from my 2 accounts.

I am on the latest version of Thunderbird, Supernova 115.10.1

Also, I cannot find out where to change my password for the accounts, because at times I need to fill in a password. I can't find it.

Thanks in advance for any help.

Best, Leslie

I've been a Firefox fan for years. I thought I'd try Thunderbird. I'm in need of some help please as I'm going round in circles.

I am trying to link my btinternet email account to Thunderbird. Thunderbird cannot do it automatically so I have to enter the details manually.

I have all the right settings according to BT: Incoming POP 995, SSL enabled but not StartTLS. Outgoing Port 465, SSL enabled not StartTLS. mail.btinternet.com is used.

The User Name and Password are correct but Thunderbird cannot connect to the account. There are no Firewall issues.

Something is happening because BT have notified me of potential unauthorised access and I have to reset my BT password. Even when I enter the new BT Password Thunderbird cannot link to the account.

Any suggestions as to what might be causing the problem? Thanks.

Hi

I am running Thunderbird on WIndows 10. I have eight different email accounts, but only one profile.

This morning on startup, all accounts and folders were gone and the "open your account" tab was open.

After several hours of frantic searching on the net, I took the most recent profile "prefs-9" and used it to overwrite "prefs.js" This brought back all my local folders and saved emails.

However, the email accounts used to be Wotsit@gmail followed by Inbox, Sent, Draft etc. Now the first account name has been moved, leaving behind its old Inbox, Sent etc with the correct email count but nothing at all in the right hand pane. The account header has re-appeared amongst other account headers but with nothing in the Inbox, Sent etc.

What I need to do is make all the emails visible in the "headerless" section, and return the correct header above them.

Here is what it sort of looks like -

Inbox (3) 2100 Sent 998 Drafts

Then further down after other accounts - Wotsit@gmail.com Inbox Sent Drafts

How can I move the Wotsit header back to where it should be?

I really appreciate the help you folks offer, and the time you put in helping us mere mortals!

I get this Error message when I try to send emails from my outlook email address in Thunderbird. Basically asking me to enter a Password to login to office365 server ! My Password is correct, and has not been changed recently.

Any ideas please ?

Hi 😊 I’m trying to resolve my sisters’ issue with Thunderbird, and I know nothing about Thunderbird. When I open Thunderbird, I have an issue in that the Archive folder is there but no content is shown

Yet if I go to where the files are they seem to be there. They were working but I accidentally deleted the folder and out of the trash folder as well. If I go into “C:\Users\Sue\AppData\Roaming\Thunderbird\Archives.sbd” where the emails and folders are, they seem to be there but not showing in Thunderbird when I click on any folder in Archive and are appear top be very small, i.e. empty.

I have screen shots if you require but thought not appropriate at this stage.

is there a way to include or insert custom code into the head section of outbound Thunderbird emails?

Note that I am not talking about custom email headers, but custom html into the <head> section of outbound HTML emails.

Thanks!

I have created two lists of email addresses to which I want to sent the same email. However I can't get the list into the address bar either To. CC or BCC. As there are some 20 addresses typing each address in the list, I had hoped that I would not have to type all of these again each time I send out an email. Any help would be most welcome.

This can't be this difficult. I need to setup a separate IMAP and SMTP server for accounts. I use SendGrid, so I need my IMAP to my server and SMTP using SendGrid's SMTP. However, it seems Thunderbird can't do this and only stores one password per account?

I hope there is a solution to this. With e-mail spam filters and such, if this isn't possible then I need to find another email solution. I've used Thunderbird for years and love it, but this might be what pushes me to something else, because I don't have a choice anymore.

Thanks for any help on this issue.

Using windows 10, windows firewall, windows antivirus, Thunderbird 115.9.0 (32-bit)

Can't send from Optimum accounts.

Error message "Sending of the message failed. An error occurred while sending mail. The mail server responded: Spam detected by content scanner. Message rejected (ID 661FD756017B2BC6). Please check the message and try again."

Check outgoing server setting, tried changing authentication method, but got the same error.

So running thunderbird 115.10.1 (64-bit) and more and more issues:

• the app keeps getting non-responsive for long period of time, to fix this I have to force quit the app.
• at times when composing an email the app freezes where no typing occurs for seconds or typing is very slow or after typing awhile the text suddenly appears.

Seems to be happening more and more trying to figure out how it can return back to it's rockstar state when it was <99 version.

any help would be appreciated.

Just switching between inboxes can cause up to a 10 second delay with Thundebird "not responding" with the spinning wheel. It has been like this for the last few laptops I've had and through all the updates and I am getting ready to call it quits. I did a performance recording of me just clicking through the different folders and then it locks up on one. You can see it here https://share.firefox.dev/3WlrRi9

I am using a primary gmail imap account, an office 365 imap account, and another imap account from an ISP.

On Win 10 LTSC, CPU: 16 x 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz @ 2304 MHz 10240 KB Cache, MEM: 65277 MB, 60% (39120 MB) free, GFX: NVIDIA GeForce RTX 3080 Laptop GPU 16192 MB

I understand the basic differences between unread folders and unified folders what I don't understand is why two of nine my accounts are listed in both unified folders and unread (see circled in red) how do I remove the two accounts from unified folders or

add more to it
and what makes it confusing is that the subfolders aren't the same when listed in unified or unread

Hello, I did look for related posts but found nothing close enough to this so I thought I would create a post. I don't ever recall having this issue before v102 was introduced but now it happens once in a while but not always.

If I am in the inbox of my main mail account and choose to delete a message, it goes away and then reappears almost immediately. There is a box that shows up at the bottom right of the screen that says: The current operation on inbox did not succeed. The mail server for account (my main mail account is shown) responded: UID MOVE failed. This account is in Canada on the Bell Canada network so perhaps it is an ISP issue?

I have 3 mail accounts set up - all IMAP. If I close TB and reopen it, the message is gone as if it required the program to close in order to complete the delete request.

If anyone has experienced this and has any suggestions or tips, it will be greatly appreciated. - Thanks, Mike

Today, most of messages have suddenly disappeared from my TB inbox, leaving only the most recent 105 out of approx. 18,000. I have not performed any operations (compacting, archiving...) that could have caused this.

I immediately invoked the 'Repair Folder' command, which did not resolve the problem. Further investigation revealed that the 'Inbox' file ('Profiles' folder) actually contains only 105 messages - seems like the 'Repair Folder' truncated the file!

Fortunately, all the messages are still on the server. My question: Is there a method to 'force' reloading of the missing messages?

Thanks, Ray

Hello

Yesterday there was update in Thunderbird and went well. But today, Thunderbird suddenly asking for credentials and then it went totally blank as in screenshot. There is nothing at all. But incoming mails are still showing up in windows notification and it can be opened as new tab of Thunderbird. I have been searching the possible cause and solution from forum and internet, but no luck. Can someone please help me about this ?

how can i stop thunderbird from interacting with windows defender anti virus scan? when ever i download or delete emails i get a few seconds of "not responding " and the whole computer is non responsive. i used to be able to turn off real time scan in security and it would work for a day and then windows would enable it again. now since the last upgrade windows isnt allowing me that option any more. solutions?

I am asked to get a new password from my mail server (AOL) every day when trying to send messages. Have to log on to AOL, ask for app password, enter at Thunderbird. DAILY!