Thunderbird コミュニティフォーラム

I have been using Outlook Lite to keep my work inbox separate from my personal, I was going to switch over to Thunderbird however I need authorisation from my IT Dept to allow access. What do I need to detail in the request to them in order to quickly / easily get them to process this?

checked with OPTUS no solution. my X@optusnet.com.au cannot transmit but only receive. All the others are OK. Had error messages for at least 3 months when I try to send!! LAST Message was mf-505: Sender Policy - Relay Denied. Please verify that your email address is correct in your account settings and try again.

You may have a mis-configured setup. See the Thunderbird section at https://www.optus.com.au/support/answer/using_an_email_application_with_optusnet_email_1434.

(PII redacted by moderator)

My new Greenby account was hacked I had to delete thousands of scam emails so my Mozilla account appears to have been blocked. Can I get back into Mozilla or have I been permanently block

Hello. I am trying to add a new provider, which means adding a new account. When I click "Add new account" it takes me to a page that asks me to enter my existing account. Does this mean the currently running account or the new account?

I keep getting message "The certificate for imap.gmail does not come from a trusted source". I've uninstalled thunderbird on occasion and it fixed this problem, but now it keeps coming back. bold text

I have a client who has been using Thunderbird for years - in the last couple of weeks when doing his normal scan to email he is suddenly getting this error message, after filling in the email details and clicking send

"Sending of the message failed - there was an error attaching xyz.PDF. Please check that you have access to the file"

Process is... 1. do a Scan to Email via the Brother printer console panel 2. Scan completes and opens the TB new email message - File saves into the default folder \pictures\cc4\email 3. Fill in the recipient, subject and message body 4. Click send message in TB 5. Error above is presented

I can open the the attachment within Thunderbird to check it and it opens just fine - the scanned file is actually there... But click the send button and that error is presented.

I can fix it by removing the attachment and reattaching manually from the email folder where scan is saved.

When I try it myself (remote support), either via the brother CC4 app or getting client to trigger the scan to email, it often works, but invariably he calls back after his next scan to email and it is broken again...

Scans were saving to a Onedrive folder originally, moved the save location back to the standard user/pictures/cc4 folder assuming Onedrive may have been interfering, but it is still behaving the same.

Anyone have any clues what might be going on here? The brother software seems to be doing what it is supposed to. I have reinstalled both the Brother software and Thunderbird with no change... Windows updates maybe?

In the interim I have him doing scan to file and attaching manually, but would be nice to get this sorted for him...

its an Acer laptop running Windows 11 pro 25H2, TB version was 150.0.2 originally but still doing the same on the latest 151.0 that I installed two days ago

Thanks for reading... any help appreciated

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I opened Thunderbird 140.9.1esr from flatpak on Debian 12 and today I noticed a message that says: "Flatpak ESR application ID change We're switching the Flatpak ESR application ID from org.mozilla.Thunderbird to org.mozilla.thunderbord_esr."

1. How does Thunderbird know it's flatpak name is changing? How do i turn off all auto updates including checking things like flatpak name changing?

I am using Thunderbird email client for past 3 yrs and have been keeping it updated on regular basis. The present updated release is 151.0.1

Yesterday all 3 of my IMAP emails accounts stopped downloading emails. There was a red marked 97% IMAP quota used message in the right bottom about 3 days back which is not visible now.

Is this problem related to this issue? If yes, what's the solution to resolve and start using Thunderbird?

BRegs, Pankaj

As of a few days ago, I have the latest thunderbird installed and can't say when this began happening, but despite it working for years with two gmail accounts, neither gmail account will now sync / connect and it has authorization issues.

I've then tried running thunderbird in a sandbox / uninstalling / reinstalling / deleting the user profile / registry entries, you name it...when setting up a gmail account in thunderbird, an error of "Authentication error. Unable to log in at server. Probably wrong configuration, username or password." come up, despite the password being verified as correct.

If I manually setup gmail using the gmail settings, of imap.gmail.com / port 993 and SSL / TLS and Oauth2, and do a test, I'm met with "Connection to server.imap.gmail.com:993 failed"

Nothing has changed on my computer in the time leading up to this not working. No windows updates performed...no changes to the firewall etc. You name it. I've checked it all.

Strange! Any ideas? Thanks!

I'm seeking a minimal Google, Facebook or Gmail environment. I use an android phone and an Apple miniMac os. Do you associate or offer an email service that allows me to achieve this?

Suddenly Thunderbird takes a long time to download even a few (10-20) emails from Gmail and then it freezes on an email and as I click on different emails only the original one shows on the bottom half of the screen, even if I change to a different folder/email account. Also it will not close when I hit the X in the upper right corner.

If I click on one of the other apps, such as Calendar it goes to calendar but when I go back to email it still shows that same frozen email.

I tried clicking on the three bars (hamburger) to find the Thunderbird version and nothing happens.

I have restarted the computer but that has not helped.

This is an add on to the previous portion that I wrote yesterday. Today nothing shows in the portion where I usually view the message after I've clicked on it. Also the options in the tool bar such as File, Edit, View etc. do not respond to a click after the first time I have attempted to look at a message.

I am considering uninstalling and reinstalling. If I do that will it find all my emails and folders etc. again? There are a few emails that I am quite desperate to access that I have put in folders.

I'd really appreciate any help I can get on this as some important work is being delayed until I can access those emails.

Thanks for any assistance!

Good morning

Since this morning (05/03/2026) Thunderbird freezes within a minute or two of opening the program.

Everything in the program freezes up. I cannot even close it.

I am running Version 140.8.0esr on a Windows 10 PC.

Initially I was getting a pop up warning message that ask me to confirm if I wanted to send an email with attachments of over 20 MB. There were 3 or 4 such messages. I had not tried to send such emails.

I checked the Outbox in Local folders for old messages, but it was empty. I also checked the Unsent messages files in Local Folders in the Profile folder. I deleted the Unsent Messages.msf file to no effect. I renamed and replaced the Unsent messages file. Also no change.

I checked for crash logs but there are none.

I have run out of ideas as to what to try next. Does anyone have any advice?

Hello,

Everything working just fine last night. Wake up and Thunderbird will not retrieve emails.

Remembered this old message I got so I went through and deleted my second email address, didn't help.

https://support.mozilla.org/en-US/kb/thunderbird-and-yahoo

Checked all settings compared to Yahoo, still won't download messages. I can even send a message with my current settings no problem, and it does login, just won't retrieve emails. Gives me a connection timeout.

Anyone have any ideas?