Thunderbird Community Forum

What are the memory limits for Thunderbird. Currently, I get this message when I try to save and email "Unable to save your message to local folders. Possibly out of local file storage space." Please see attached screenshot.

I am not out of storage space.

Any suggestions?

Thank you.

Tom O'Brien

I installed Thunderbird on my new laptop, then imported the profile from my old laptop

The main screen has, under "Inbox", folders for Drafts, Sent, Trash, Archive and Spam, which are being used by the program

Folders for Drafts, Sent and Trash also appear under "Local Folders" (along with Outbox) and these aren't being used by the program.

How do I get rid of these duplicate folders? "Spam" had a delete option, so that was easy, but the others don't.

I tried the two suggestions for a previous "Duplicates" question but they didn't resolve things.

Thank you

Ciao, premesso che non sono tanto pratico come verificherai dalle mie precedenti discussioni con tuoi colleghi, ho installato l'ultima versione di Thunderbird su importanti segnalazioni di criticità dell'antivirus Kaspersky che suggeriva di installare l'ultima versione pertanto ho lanciato richiesta di aiuto al forum della comunità che mi ha inviato il link tradotto in italiano avendo (x64 it) ho scaricato e installato ma senza successo perchè è rimasto sempre in inglese, forse non avendo tanta conoscenza di passaggi da eseguire non so. Spero che comprenderai la questione auspicando un tuo cortese aiuto ha risolvere il problema cmq grazie e saluti. Renato

I am setting up an I select "Invite Participants" the pop-up screen locks up.

I have tried to change accounts one at the time with no luck. I also selected the "Attendees" tab near the bottom of the pop-up. That did not help either.

This is running on a Windows 11 Home operating system.

Any help would be appreciated.

PS - I moved from Microsoft Outlook to Thunderbird as I did not like the new Outlook. This has been very frustrating.

Hello Smart People:

I have literally decades of emails from a prior job that I want to detach from T-bird without deleting them. I hope to drastically reduce the size of "Local Folders" so I can more easily transport my email from machine to machine.

Archiving won't work in this case because it retains the mail, when I really want it removed, but accessible again later.

How can I do this?

Sincerely, Bob

I see others are having this same issue with no resolution in sight.

The company I work at is unable to print anything through the print preview in Thunderbird. The current work around is to download, open, then print the file.

Does anyone have any further information on this subject besides going through separate avenues to fix the problem?

Thanks!

About 6 months ago T-bird stopped sending outgoing messages. Each time I typed even a test message to send to myself, it rejected. Everything else works. I have defaulted to my Comcast email client which is not as friendly as T-bird. T-bird is up to date and none of my settings for outgoing mail was changed. Why won't my mail all of the sudden not process? What do I need to do? Thanks in advance.

Message I get when mail is sent below:

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-a2p-647141.sys.comcast.net resomta-a2p-647141.sys.comcast.net ESMTP server not available (396356/151.247.189.217).

With a new Windows11 install on a new drive, I can't get my saved emails, folders, and passwords to my new Thunderbird installation. I tried copying the profile folder from my old Windows10 per instructions, but Thunderbird doesn't recognize it on this new Windows11 install.

I can print e-mail, but not the attachmnet since yesterday. So I contacted HP-support, but it is not the printer. The last attachment I printed was before the last update of thunderbird. What can i do?

I'm currently making a custom theme for Thunderbird for my own personal use. I've gotten pretty much everything how I want it to look – except the main content. I prefer light mode for accessibility, and currently it's stuck in dark mode everywhere (my settings menu, calendar, mailbox, etc).

The first image is how it currently looks, and the second is how I want it to look (the black boxes are there to block sensitive info). What would I need to add/edit in my manifest.json and/or style.css to get there?

I want to configure an automatic response to emails that have been forwarded to me from a particular address. I have created a template for the response and it is saved in the Templates folder. I then attempted to create a Filter Rule to send the response. I believe there should be a Reply with Template option in the Perform these action pull-down, but there isn't. I've attached a screen shot to illustrate this.

I'm using Thunderbird 154.0 and Windows 11. Is there a new way of achieving my objective?

I had to recently change my password on my shaw email account. Now thunderbird won't download my emails. I changed the password in the account settings to match the shaw email account password but I keep getting an error message: "Host contacted, sending login information..." and then after a long delay the error message reads "Login to server pop.shaw.ca with username ... failed". Any idea what I'm doing wrong by simply changing the password? I think this happened before and some wonderful human on this forum told me I had to put something before the password or click/unclick a particular box, but I can't find that old answer to my previous question. Thanks in advance for any help someone can offer!

The 'new' Thunderbird doesn't allow a password entry in server setup and will not prompt me for one. It pops up a Windows toaster message saying it can't connect - obviously. I set the advanced options to not remember the signon but still no success.

Every 10 minutes, your Thunderbird app generates an attachment (nmsa) that McAfee deems a Trojan and quarantines it. I get 15-20 popups from mcafee every hour. If I close Thunderbird it stops. What can i do to stop this from happening?

Trojan:Win/SuspiciousAttachmentScript.a

C:\Users\ken_s\AppData\local\Temp

Back when W110 went to w11 I got a new computer and was given great directions here to back up my TB profile by searching %appdata% and copy the thunderbird folder to external source. That file is 198 MB. I do this every month now ..It is my understanding it saves my profile and all emails including local ones. Now in Aug 2026 when i copy this file, I am getting an error a file is too long and have no choice but to skip that file..I will attach a pic of the error. Is this back up ok to use or is it corrupt because of the error?

I also found in TB help there is an export feature in TB to a zip file but that .zip is huge..I did one just in case. I think you just open TB>select hamburger menu three lines on top right>tools>export. I did that back up/export also today and that is a .zip file folder that is less properties like 175 MB.

So now which way is the correct way to keep a safe copy of my TB in case my computer crashes or i have to put on another pc?

I have forgotten my password and even my username in Thunderbird mail. When I try to get a new password, they send it by email. Since I cannot get into email I do not get the code. I want to completely remove my account from the server so I can start fresh. This takes me to username and email + password. I enter the new details and the server having not deleted my account sends, "Incorrect email or password. This is why I want to delete it completely so I can really start a fresh setup. I am using Ubuntu 2404.

Thank you for your help.

Rod.