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I'm using Thunderbird on Windows 11 with my Outlook email account. I can receive email, but when I try to send an email, it tells me the password is wrong.

[moderator note, the following is unrelated] When I check the password in the Privacy and Security settings, Thunderbird has changed the password to a long string of letters, numbers, and symbols. I enter the correct password, but it keeps changing back to the incorrect password. I have tried deleting and re-adding the account. I have also uninstalled and reinstalled Thunderbird. Same result.

hi, if i sync 2 t/bird installs which one will install its personal data on the other pc?. the same question also applies to my f/fox install if anyone knows

win 10 tb145.02

thanks very much if anyone knows

When I am typing an email in Thunderbird, regardless if I have my font size preset to Extra Large, Large, or Medium, the font that appears in the email while I am typing the email, is very tiny, so tiny it is hard for me to read it. Yet when the email is received by the recipient, the font appears the correct size as selected in composition settings. How do I fix this?

Over the past month or so, as often as not, when I receive an email it is immediately deleted before I can read it. I have not modified the program or installed any new software, antivirus or otherwise. Is anyone else experiencing this problem and, if so, do you know a fix? Thank you.

My Address page for New email Contact has gone outside the screen & I have no SAVE button so I cannot complete and save an email address I have tried to use the Zoom button as I had on Windows 10 -= but doesn't work for me on Win 11 ????????????? Eric

hi i have 2 pc's using tb , one can sign in to my outlook.com acct, but the desktop pc can not. have checked all setting etc

the working installation is on esr update channel, other on is not [so i have 2 difference tb versions]. both are updated

if anyone sees in a forum that i had email trouble recently pls note that i now have an old backup of win10 in service on the desktop pc. haven't yest found my way back to that forum to post the results of using peoples advice but they were very helpful

thanks if anyone can assist

my thunderbird freezes at the point of checking mails. when i try to update it, it opens a new application completely and doesn't update my present one. i also can't find the location of the app or the data. pls help!!!

I must have changed something because T'Bird no longer starts. I was trying to copy TB file from Win 10 to a Win 11 PC. That failed because some files could not be copied. But now TB is not starting up. I checked the Start folder and it is in there.

Suggestions please.

I have just started getting this error message when sending email from my @live.ca account. I do not get this message when sending from a @gmail or @company.ca address.

Quote: "Sending of the message failed. An error occurred while sending mail. The mail server responded: Non-Compliant sender address. Code : -1. Please check the message and try again."

I can send and receive email using this address from my Android phone or from my Windows eMail client, so why is Thunderbird causing this? I have looked through all the setting and cannot find anything different from the settings for the @gmail accounts.

Thanks. Dave

Hello Everyone,

Background: Using Thunderbird for almost an year and extremely happy with the product set. I use it to access GMAIL via POP and use the settings "After the email gets downloaded to my computer, delete the GMAIL copy" (Settings attached).

My usage pattern which changed recently: Earlier, I will always download emails using Thunderbird every day and it was working perfectly. Recently I have to travel for few days and during those days I will access my GMAIL via my android mobile primarily and I download all the emails after my return.

Current Issue: Now after I return, all the mails gets downloaded, but it does not get deleted at GMail side (online). From the time I started using Thunderbird after my return, the newer emails from that time are getting downloaded and deleted but the old emails stay in GMail. Current inconvenience is it takes time to validate if all the important emails are downloaded and I cleanup the GMAIL manually and then we are all in sync. This continues until my next travel. I tried resetting the GMAIL POP settings and there is no improvement.

Any pointers or suggestions to resolve will be gladly appreciated. Thanks in advance!

Hi everyone,

I've moved from Windows 10 to Kubuntu 25.10 and recognized that there's no number of unread messages shown at the icon for Thunderbird in the taskbar. I've googled around and found suggestions of to install libindicator, extensions in Thunderbird, enable some settings etc. But the mentioned setting doesn't exist for me, the extension isn't available any more and installing libindicator didn't change anything. So, it looks to me like all of that info is simply outdated and some of it was from 10 years ago.

OTOH, what I can enable in Thunderbird is a notification whenever any new mail comes in. But that's not what I want. I would just like to see a counter at the top of the icon showing the unread messages. Individual new messages when arriving aren't of that much interest to me, I just want to know that there are some and I'm going to look at them at some point.

So, does Thunderbird support such counters for the KDE desktop environment? I simply don't think so.

Thanks!

Thunderbird randomly archives a significant percentage of my emails. I would like to stop that and control which email is archived. Is there a way to accomplish this? Thanks.

In both my Inbox and my saved email folders, when I click on an end-to-end encrypted email, Thunderbird (v145) displays "Loading Message..." and then blocks with a spinning blue "working" cursor for on the order of 30-60 seconds. The Thunderbird dialog then appears to make some progress, as the windows seems to "flash" as if it's being cleared, but the email content doesn't appear. After about another 20-30 seconds, the encrypted email contents appear, correctly decrypted.

This long delay only occurs when I click on encrypted email messages, and it happens every time I click on an encrypted email message, and this behavior only started occurring in the past couple of days (correlated, I believe with Thunderbird updating to v145) so I think it's safe to assume the issue is with end-to-end encryption/decryption in Thunderbird v145.

Hello,

I have a MacBook Air M2, and I'm experiencing energy usage issues related to Thunderbird. This has kept happening for a long time now actually, surviving through at least two Mac OS updates, and a huge number of TB updates. Everything's up to date. I tried to follow this: https://support.mozilla.org/en-US/questions/1269944 and this: https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems?_gl=1*86dj4d*_ga*MTkzNzQ0MjA3MS4xNzYyOTY4OTMx*_ga_2VC139B3XV*czE3NjMzMTM3NDckbzIkZzAkdDE3NjMzMTM3NDckajYwJGwwJGgw but didn't succeed. Actually, in my case, the issue is more noticeable: I normally have TB open in background - sometimes everything's fine, and the battery goes down as normal, while sometimes instead the battery drops quickly, and checking in the Mac activity monitor I can see that the CPU usage of TB is totally abnormal. When this happens, I can actually see the activity bar in TB being live (bottom right corner, as it happens when TB is checking for new mails), but never disappearing. When I notice it, I just reboot TB, and the bar shuts off as normal after a quick mail check. Moreover, checking the 24hr energy usage by app, TB is often on top with nonsense values.

I tried multiple times to rebuild the database, and do most of the tricks suggested, but didn't fix. Yes I have a huge mail archive, but the problem is not the standard management of this database: basically it seems that every now and then, TB decides to run some activity which it gets stuck in, and this kills the CPU.

Thank you in advance for your help!

After clicking on the message pop-up on the Thunderbird email client, the email appears blank,Open other windows to overwrite, then close other windows to resolve the issue. How can I view emails normally after clicking on the message pop-up

I am unable to connect Thunderbird to my “Personal” Outlook.com mail account. I installed Thunderbird on a new laptop with Win11-home. I connected to yahoo and icloud without issue. In the past I used an app-specific password to connect Thunderbird to Outlook. But Microsoft no longer allows me to make app-specific passwords on a personal account. I have two factor authentication on the MS account. I have tried turning off virus and firewall protection, without success.

When I create a new email account in Thunderbird I get the following error. “Authentication failed. Please check the username and password - Exchange auth error”

If I put my personal name in the Your Logon field, rather than my email address, I get a Microsoft screen pop that shows “oauth2” in the URL. But if I click the personal account they present it quickly fails.

Is there a workaround, to fix this, since I can’t get a app-specific password and have two-factor authentication on my Microsoft account?

Thank You for any help you can provide. I have spent a day researching this without success.

Kurt