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Recently, T'bird has been labelling all emails sent from my account as coming from my wife's account. My bank ignores me because the emails aren't coming from the registered address. I haven't (knowingly) changed any settings, but I'm temporarily using a laptop which has a mind of its own! Any suggestions for a fix?

Group contacts have been established and the group is listed in the Address page. An email is prepared and the group name is inserted in the bcc slot. An x appears to the left of the group name. The Send button is grayed out and the email can't be sent. What is the problem?

Add Security Exception? I can't send any outgoing email messages. I now get a warning alert after hitting Send entitled "Add Security Exception". It says further, "You are about to override how Thunderbird identifies this site." And, "Legitimate banks, stores and other public sites will not ask you to do this." My email provider is Earthlink and the alert identifies the server location as, "smtpauth.earthlink.net:587" and says, "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."

That only available options are, "Confirm Security Exception" and "Cancel". Selection of either option brings up the same next alert, "Send Message Error", "Sending of the message failed. Peer's Certificate issuer isn't recognized. The configuration related to smtpauth.earthlink.net must be corrected."

I didn't intentionally change any settings or receive any notification from Earthlink to that effect, so I don't know why any of these protocols would have changed. I can view the smtpauth.earthlink.net certificate but I don't know how to copy it or attach it for diagnostic purposes. Can anyone provide insight regarding what is going on here and how to resolve it? Any solutions will be greatest appreciated.

Could someone please tell me what the latest version of Thunderbird is on the Release Update Channel? I am on version 139.0.2, and when I check for updates in the app, it says that Thunderbird is up-to-date. Is version 140.0 not going to be available on the Release Update Channel?

Hi,

I have just started using Thunderbird and I'm trying to change the default colour for a hyperlink.

I have tried about:config -> browser.anchor_color and browser.active_color but neither has worked.

I also tried using a user.js file but that didn't work either.

I would have thought this would be a fairly basic thing but it seems to be impossible.

I installed Thunderbird (T-bird), and on the "Set Up Your Existing Email Address" tab, I entered my Xfinity e-mail address/password and clicked on "Continue". T-Bird is able to find the proper configuration in the Mozilla ISP database. I clicked the IMAP radio button and then "Done". That opens a popup window with the heading "Enter credentials for <my-email-address> on imap.comcast.net, but the window never prompts for anything (a prompt for my Xfinity password is what I expected). Instead I just get a message headlined "Unable to connect", with the subtitle "The connection was refused when attempting to contact localhost". This is followed by three suggestions for why that might be the case. I verified that: 1. The Xfinity site is NOT "temporarily unavailable" - I can log into Xfinity directly and see my messages. 2. My computer's network connection is operational since I can load any website at will. 3. I do have Windows firewall enabled, and I suspect that is root of the problem. How can I permit T-Bird to access the web??? Thanks.

when I click reply to an email the new message font size decreases (hard to read) and I can only type in the same size font as the original message and can find nowhere to increase font sizes etc

I have used TB a long time. It is not now working. I never had a Password? I do have a Mozilla PW (not given here) donated several years ago. This is the story. I got a new phone. Didn't remember my Google PW. The sales man decided to redo my PW. It screwed up Google. Now I get the screen attached. The screen does not work and Thunderbird does not RUN. I get calendar and can write but not send or receive??? Second screeen See attachment. All my mail is via GMail. Perhaps I need to remove TB and reinstall???? Please help this TEXAN in Humble, TX tele <redacted> HELP

For a couple of months now I have not been able to keep the email client logged into my email account. Every so often I have needed to re-enter my email password in download my emails. However, this does not happen with my email on my Apple iphone, it functions normally. Last year, I added a laptop email using Thunderbird and it also is now having this issue starting about the same time as my desktop. I did not have any issues with my email until several weeks ago and it happens on both computers. I asked here what to check, and followed the instructions given here, still no change. In fact, on my desktop, it no longer will download any emails, no matter how many times I enter my password.

I use the desktop for my regular email use, with the laptop used for when I travel. The iPhone is mostly as notification of emails so I can answer on my desktop.

Let me repeat, everything has worked well and without issues until a few weeks ago. I made no changes in my settings prior to that, no changes to my internet provider, no other changes than normal software updates to Thunderbird.

Thank you for your past guidance and for future help.

I can get to the "stored passwords" box, but the email I need to change the password for isn't listed there. I have tried to send and receive messages but nothing makes a "enter your password" box pop up. All I get when it tries to retrieve messages from Gmail is a box to give my email, (just that, not a password) and then an error message that it won't work and there is no more information. I'm using Linux. I've had both this particular email address (as well as others) and Thunderbird for years, perhaps two decades, and I can't figure out what to do now. I was going to change all my email passwords for security reasons, but there's no way I can do that until I can get Thunderbird working with POP access again. Thank you.

After installing upgrade to 139.0.2, POP downloads failed. Last was on 6/19/2025 at 8:19PM. I deleted both saved passwords.. Went to AOL and generated a new APP password but there was no way to upgrade to it. I sent a test message to myself [ smtp] and AOL logged me in and TB generated the saved password oauth://login.aol.com (mail-w).

However even with shutdown TB and restart, there was no request for a POP password [ such as the new AOL APP generated one. What should I do? Is this a bug? I can read and use AOL mail on my browser [EDGE]. LKint@verizon.net

Please forgive a very basic question. I think I know the answer but would appreciate having the correct one from the pros.

My wife and I each have Thunderbird installed on our computers. While we each have individual email addresses, we also have one email address we share, and we access it via Thunderbird.

If I'm marking certain messages as junk on my computer, will that designation only apply to my computer or, because of the common email address, will it mark those same messages as junk on my wife's computer?

Thanks for any help with this.

Andrew

I use Spectrum (brighthouse.com) for my email server. I am using it on my current laptop. I have tried to put the same settings onto my new laptop and it won't work. I have contacted Spectrum and they are the correct settings. Now it is asking for a new password. that also didn't work. I am still using my previous password on my old laptop and that is working.

I am having some trouble getting Thunderbird to display all my messages. I tried troubleshooting mode and found that all the messages were displayed. Restarting in normal mode having disabled my extensions and hardware acceleration, the problem returned and I could not see most of my messages. So I need to make the other changes that troubleshooting mode makes. These are described at https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird as

• Window and sidebar size and position settings (described in terms of Firefox)
• userChrome and userContent customizations ; see userChrome.css and .js and userContent are unsupported

I do not understand what these are and how I can set them for routine use. Can someone point me to an explanation? Thanks.

How do I reverse folder compaction? I accidentally did a compaction and now ALL of my emails have disappeared from my folders. The Inbox in the Folder Pane still shows the number of emails in the Inbox, but the large window that shows the emails is completely blank. I captured a screenshot but can't attach it. Thanks, Hal

After the last update to Thunderbird 139.0.2 on a windows 10 computer, the write button doesn't work. When I click it nothing happens. I receive messages and can even reply to messages I just can't write new messages. The error console shows an error: 1750426957343 addons.xpi WARN Checking C:\Program Files (x86)\Mozilla Thunderbird\distribution\extensions for addons UnknownCollectionError: Unknown Collection "thunderbird/moz-essential-domain-fallbacks"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

EssentialDomainsRemoteSettings.sys.mjs:110:15 UnknownCollectionError: Unknown Collection "thunderbird/url-parser-default-unknown-schemes-interventions"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

SimpleURIUnknownSchemesRemoteObserver.sys.mjs:114:15

I think I have turned add-ons off and still have the problem.

As noted in my question something odd has appeared in my Thunderbird Email. Can someone help me get back to all English. I double checked my TB settings and it appears they are all set correctly.

Thanks, Brad

Hi there I tried many solutions that I found concerning body text not displayed. But hat no success. Let me describe in detail. From one day to the other the following happened. 1. Emails in the local folder stored on a NAS (for archive purposes) did no longer display the body text (from one day to the next) However I could still transfer them into the corresponding inbox and then read them. 2. Upon trying to change settings, reinstalling the newest version of Thunderbird and also an older version, the solution of putting the emails into the inbox and reading them or forwarding them to another account does no longer work What I tried:

      1. Repair the Folder:
      2. Rebuild the Global Database:
      3. Check for Add-on Conflicts:
      4. Verify Account Settings:
      5. Examine Local Folders Storage:

Now my knowledge is depleted and I am looking for help. Thanks in advance. nelexc