Thunderbird Support Forum

I keep getting the message that TB can't connect to my server. I am able to go to my server in a Browser window, I have re-entered the password Multiple Times and it still will not connect. What else can I look at? Tony

Thunderbird has for the past few days begun giving me this error message every time I lick into your program. "Login to server imap.gmail.com with username rg.mccormick43@gmail.com failed". I am also recieving this message for aol.com.

Interestingly, gmail messages continue to come into the program but I cannot send any messages. Unless this is fixed quickly I will drop your program and go back to using google, which I hate, for my email program.

For the past several years I have been dealing with Thunderbird occasionally freezing on me, with the window losing focus and the titlebar saying (Not Responding).

It appears to happen when TB is downloading email. If the emails are large (as some are) TB stops everything to deal with it. I have looked for where to change any settings to allow for process threading, since that was the promise of Windows waaaaay back in 1990. Not so, apparently with TB. Even if I'm in a separate window composing an email, it freezes. I wrote about this back in 2018...

https://support.mozilla.org/en-US/questions/1233121

I noticed that this only happens when downloading emails from one particular account, which I use for receiving project code error debug reports. The emails are typically around 150k or slightly less. Not so huge that it should take so long to pull down, but the debug info is in many, many nested tables and divs. Is it trying to render them, even though I don't have them open?

In any case, I set that account to no longer collect. Yet, every once in a while, it still collects. Do I need to remove the account from TB altogether? I would like to be able to have this account checked every 15 minutes like my other five email accounts, which don't cause me any heartache, but it's driving me mad, especially when a throng of those emails come in, like 50 at a time, and I am effectively prevented from doing anything in TB for up to five minutes. I suppose I could craft the emails to be smaller (it's my own code that is sending the debug reports) but the info in there is there on purpose.

Is there a setting I can change somewhere to break off the processing for the main window and the compose windows?

I ran into an error on my Windows 11 PC. If I add an attachment via the system menu called up by the right mouse button, the size of the attachment is displayed in terabits and cannot be sent :-)

Hello, The Optimum SMTP is recently rejecting emails I am sending from one of three Optimum email accounts that I have. When using the one account I get the following rejection notice:

Sending of the message failed. An error occurred while sending mail. The mail server responded: Spam detected by content scanner. Message rejected (ID 6661A65F0037E564). Please check the message and try again.

This only occurs when I use Thunderbird to send messages. If I use Outlook on the same computer, I do not get the error. Previously, I was getting the error on all three accounts, but when I upgraded to 64-bit Thunderbird, the problem went away. Of course, I called Optimum and they said that the problem was on my side and were not helpful. They also don't take any responsibility if you don't use their web interface.

I would appreciate any ideas that anyone has on what I could try to eliminate this problem. Thank you.

We have had thunder foe a few weeks now and have been very happy with it. Today it suddenly stopped sending and receiving emails. I have checked the help page but am struggling to figure out how to fix. Can you please help. Cheers Colin

I just started using TB about 2 weeks ago. I have not even gotten to the point of installing a eml to mbox software to move my folders, etc into TB from emClient. I am changing because emC quit authenticating 'out of the blue'. I have been getting and sending emails perfectly well in TB until about 4 days ago. I get a message that says it cannot connect to Comcast server. Nothing about authentication or a password. It just stopped! I talked to Comcast tech support today and they said everything on their end looked good. I have spent several hours tonight going thru TB checking everything, reading this forums notes on unable to connect, restarted a couple of times, etc. Needless to say, I am not happy and really don't know if I should ditch TB and go to a 3rd different email program. (Note: I am not one who changes often or without a fight to keep a program.) I have been with emClient for over 10 yrs. All their suggestions have not worked. I like TB and really want it to work. Suggestions please.

Today, Thunderbird has switched servers on my two email accounts. My two accounts are a Cox email which has been moved over to Yahoo and a business account which uses Gmail. I have messages on the Yahoo server but when I ask Thunderbird to "Get Messages", I can see from the info at the bottom of the screen that it's checking Gmail not Yahoo.

Okay, all of a sudden it's now back on track. I don't understand how this glitch came about. Hopefully, it won't happen again.

Bill Dinger

Dear Sirs,

Please help why didn’t support China Office 365? We are using China exchange online, but it can’t use Thunderbird login our account. We have ask them, they need the software register to their system, could you register thunderbird to their system? Thanks!

Kin

How do I get Thunderbird working again? (Out since 30.05.24) I am a senior and need easy directions to follow as not tec. savvy. I was an iinet customer - now themessaging.co

I have 2 different yahoo email accounts that I access through Thunderbird. When I added the 2nd account, it changed the SMTP Server Settings "user name" of the 1st one to the same as the new one. I received an error when I tried to send an email from the 1st account, after looking at the settings, i noticed the SMTP user name was wrong. When I changed it on the 1st account, it automatically changed it on the 2nd account as well.

I'm on Thunderbird 115.11.1 on Windows 11. I got an error that there wasn't space to download emails today. My Thunderbird profile shows this:

            121 File(s)    100,867,461 bytes
             24 Dir(s)  455,503,380,480 bytes free

In the startupCache folder File Explorer says that there are 2500 directories, 660 files, and 4.94 TB of content. The last few lines of a dir command show this. Note the weird dates on the directories and garbage names.

06/02/2024 12:15 AM 164,221 startupCache.8.little 08/16/2057 01:32 AM <DIR> }+ 3an^.1q 08/08/1997 03:53 AM <DIR> √µÇ┌╪,Pù. 05/04/1990 02:21 PM 467,310,242 4φ)τ~o╗D.cÖê 04/24/2063 05:53 AM <DIR> ╤fεª╫s₧&.╘rα 02/08/2083 12:31 AM 2,596,407,552 «-╞┐I┤U.`xs 10/22/2020 06:59 PM <DIR> *¼²Ñ▐'╣.░╦ 03/06/2078 11:59 AM 3,915,121,951 n│ê/ë∞3Γ.f└ï The parameter is incorrect.

     <DIR>          πºaîí├

▌.»δ The parameter is incorrect.

        333,948,754 Åô␦╖w6ùƒ.x▐

The parameter is incorrect. j]j.╥QwDIR> Φπ═ The parameter is incorrect.

     <DIR>          ╒0q≡ó,.@{¥
            660 File(s) 2,708,943,115,907 bytes
            664 Dir(s)  455,496,040,448 bytes free

What is the best way to clean this up?

When I try to switch profiles, I get the following error: An unexpected error has prevented your changes from being saved. I have been messing around with this on and off for a couple of months. I uninstalled Thunderbird and re-installed with no luck. This error is not allowing me to switch to a profile that I have had for over 20 years and I have lost all my Local Folders, quite disturbing. I found a similar thread here, but no solution. Thanks, Paul

Hi I am having problems with Thunderbird, i’m not sure if it’s to do with a windows 11 update or something else. Thunderbird is not responding also at the start of the ‘not responding’ emails from one of my accounts disappeared and then gradually started to reappear but didn’t get up to date and now just not responding st all. I have tried various things to resolve this, uninstalling and reinstalling Thunderbird, doing this and opening my pc in safe mode, doing this and opening Thunderbird in safe mode. Deleting and reinstalling the latest windows 11 update, reinstalling the latest Thunderbird update. I don’t know what to try next? I read somewhere to delete your profile, after saving it, and getting a new profile but no idea how to do this. Any help appreciated.

I am using Thunderbird version 115.7.0(64-bit).

The Inbox is 15.5 GB in size as shown in the attached image file,Inbox Size.Jpeg.

The Inbox folder is not displayed as the attached image file,Folders.jpeg, indicates.

Please provide me with a solution to this problem.

I have been using Thunderbird for probably greater than 15 years (back when I was in college). The last couple of years I have noticed an issue of when deleting multiple emails that has gotten progressively worse, where the entire application will hang in "Not Responding". For a test, I just deleted a batch of emails from the last month (newsletters, notifications, etc), it was 113 messages, and froze the application for more than six minutes. This was on my hotmail account but the same happens for my other accounts as well (all configured as IMAP). The issue has persisted through uninstall/reinstalls and even across a replacement computer. No extensions are installed.

Any thoughts?