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New computer, trying to install Thunderbird. "Download" created a file called Unconfirmed 750544.crdownload which isn't executable and doesn't seem to do anything. How do I proceed to do an installation?

I am using Protonmail with Thunderbird. In my Protonmail web account there is nothing in ANY folder but the very few I am currently keeping, including All Mail. The same folders and messages are represented in Thunderbird folders. However, in C:\Users\username\AppData\Roaming\Thunderbird\Profiles\wiu0xbpg.default-release\ImapMail\127.0.0.1, the All Mail folder contains all previous messages, including deleted messages, are still present. When I delete a message, I want it deleted. As can be seen in the attached image, All Mail is very large whereas all other folders are very small. 1. How can this be cleaned up? 2. How can this be prevented in the future? Thanks for any direction in this matter.

I am having trouble sending in email, i have gmail server (i am getting a time out error) i have the latest version of thunderbird i am receiving message ok, just cant send

Running Thunderbird 140.8.0esr 64bit Windows 11 Home, v25H2 932GB storage 32GB ram i7-13700k

Recently, I've started getting the following message every time I launch Thunderbird: "The certificate for imap.googlemail.com does not come from a trusted source."

Digging into details I get: "you are about to override how Thunderbird identifies this site" "Location: imap.googlemail.com:993" "This site attempts to identify itself with invalid information" "Unknown Identity. The certificate is not trusted because it hasn't been verified as issued by a trusted authority using a secure signature."

Digging deeper into the certificate I find the issuer is Bitdefender who I use for antivirus and VPN. However, the VPN shows no effect when enabled or disabled. The validity period is 2 Feb 2026 to 27 Apr 2026

l can get email, but cant send it. Is Bitdefender at fault?

I'm stumped. What should I do???

"The message could not be sent because the connection to outgoing server smtp.gmail.com was lost in the middle of the transaction. Please try again."

Mam problem z odnośnikami graficznymi w wiadomościach e-mail. Kiedyś jak klikałem lewym przyciskiem myszy to byłem przenoszony od razu do przeglądarki, w której była wyświetlana odpowiednia strona. A teraz pojawia się ikona lupy+ i obrazek jest powiększany zamiast przenoszenia do przeglądarki. Chciałbym powrócić do poprzednich ustawień, ale nie mogę nigdzie tego znaleźć. Pozdrawiam Marcin

I have a problem with graphic links in emails. In the past, when I clicked with the left mouse button, I was immediately taken to the browser, which displayed the appropriate page. Now, the magnifying glass icon + appears and the image is enlarged instead of being taken to the browser. I would like to return to the previous settings, but I can't find it anywhere.

Regards Marcin

Sometimes, my Thundermail box will upload my incoming but particially, not allowing the message to upload on my computer. (See image) I can't find a solution. It does not happen all the time. It has been going on recentl.

the problem is that when I receive an email it goes straight to delete folder there is no where I can set the filters to filter of my choosing, I have lost losing all in coming mails I am talking with telstra as one page said it is an IMAP problem in that it just removes emails for no reason but in your problems page it says I can change the filter settings but in the settings there is no place to change filter rules

I am getting very frustrated  after 6 hours and not getting anywhere  I have uninstall Thunderbird and reinstalled  but nothing changed 
running win 11os  on desktop 

what do you suggest

I am sorry, but my question is in Dutch.

Op mijn desktop werkt thunderburd in het geheel niet en is zeer traag, werkt voor geen meter.  Ik krijg telkens de melding, Thunderburd reageerd niet. Op mijn laptop werkt het normal. Hoe kan dat. Bijde computers hebben Windows 7

we are different users on the same computer at home so we've different accounts on the same thunderbird. Generally every thing is going well but also sometimes the dialog box to choose the account doesn't appear...

thanks a lot for your idea

I can't retrieve or send emails. says sending of password for user vnoel3@start.ca did not succeed. I hit ok and window comes up enter new password. I try but won't take new password. Are you having issues this morning? Thankyou for your time.