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I've read everything apropos here, tried everything, and I'm lost--and totally screwed--if I can't get into my old Thunderbird. Spectrum, computer died, nobody competent here to get past "Registry Error," I guess, but I need all the data, contacts, calendar, etc., in the T'bird I've relied on for MANY years. PLEASE help. I tried to get a screen grab: It didn't work.

This is the second time I've appealed for help.

Hello,

I am using a MacBook Pro (16-inch, 2019) 2.3 GHz Intel Core i9 8-core processor 16 GB 2667 MHz DDR4 memory

When I launch Thunderbird, the fans start up. As soon as I stop Thunderbird, the fans stop. When I close Thunderbird, I receive an error message (see attached).

Could you help me?

Thank you, Have a nice day,

My Thunderbird email has been blocked with the error message "login to server imap.earthlink.net with user [my email address] failed"

Never had this issue before a week or so ago. Please help.

Richard

Thunderbird Version 142.0 (64-bit) August 19, 2025

If I get a popup stating:

 "Check Spelling"
   "Misspelled word: ..."  (Yes, there is a "misspelled" word)

Clicking either "Ignore" then "Send", or "Send" results in:

Sending of the message failed. An error occurred while sending mail. The mail server responded: MAIL FROM:<MarkJL0@OptOnline.net> does not match authenticated user name. Please verify that your email address is correct in your account settings and try again.

This question is about TB for Android v10.1. I forward potential spam to report@phishing.gov.uk but often the message remains in the Outbox. I get a notification "Failed to send some messages. Reject for policy reason." The message is unchanged by me, but clearly it contains the address of a potential spam-sender. What should I do to comply with this well-known advice?

Richard

I am trying to add an invitee to an email done from the calendar. When I attempt to add an invitee, everything appears in the user interface to be OK. When I send the email, nothing is received by the invitee. I have even sent email to myself as an invitee and that fails as well. I found the attached error in a troubleshooting log.

I have scoured the internet looking for a solution but couldn't find one. Hopefully you can tell me how to proceed so that I can get this feature to work. I haven't even had Thunderbird for a year and now this. I have donated $100 to you so hopefully you won't see me as a freeloader who wants to complain.

Thanks

Downloaded all files from old iMac on external hard drive. Plugged hard drive to new MacMini . After I downloaded all the apps, I saw Thunderbird app down in the dock. I clicked to lunch the app and got a window that said Thunderbird was damaged and to move it to the trash. I am running Thunderbird on another device, but this new computer will be primary, I would rater stay with Thunderbird and not use Mail. Csn you help me or tell me in steps what to do. I can get my emails on my iPhone. Thank you. James

Hi team. The sent items of one of my clients email accounts seems to be invisible. It does show that there are sent times at the top of the window. When I send a new mail, that number increases by one.

Things I've already tried; Checked all account settings. Double checked things like "Place a copy in", "default Sent folder", " Subscribe" Checked all layout setting Checked all filter settings. Uninstalled and reinstalled software.

Any idea what could be the issue?

Since last Thursday I've been unable to send emails from Thunderbird with the attached Outgoing message timeout message popping up. Our hosting service has said all is OK at their end. I've uninstalled McAfee, turned off Firewall, uninstalled then reinstalled Thunderbird with no success. I'm suspicious that it could be due to a Windows 11 update - but also did a System Restore to the day before email sending stopped. Any ideas please?

I am having severe problems downloading and syncing my emails with TB 142.0. I opened TB this morning, for example, and it took more than 20 minutes for it to download my emails. When I go to the next email, it takes a couple of minutes to load it. I have had some issues with slow syncing before, but this is very bad. I note that the emails work fine on my phone. Also, this happens on my main Gmail hosted account, but also on my other Siteground hosted accounts. TB seems to be lost in some kind of loop when syncing.

Spell check in not working. I am running version 142 64-bit and use windows 11. I have checked both the boxes for check before sending, aand enable as you type. I have aslo selected a British language. i have also done a restart on Thunderbird.

I lost about 1 year of emails from pop3 account. Thunderbird lost my profile (started 1 day and it was at blank profile) and I imported an older backup .default I found. But I cannot find the profile anywhere that has the missing emails. What can be done, extensive searches for .default have been already been done?

I can sign in to Mozilla but not to my email- I get this message: Login to server mail.bigpond.com with username dla456xx@bigpond.net.au failed. I am on Win 11 on a HP laptop

Hello,

Thanks for previous assistance on this topic but the structural issue remains. I am able to add certain email addresses to my Address Book and then modify those entries so they appear in my addressing hierarchy with tags and names as I need them to be.

But in the attached examples, you will see that some email addresses from the same domain add, and others do not allow me to add. This has the unfortunate side effect of having an Address Book that is 70% usable and 30% in complete chaos because the manner in which many incoming email addresses are structured is often of no use in trying to keep order.

I attach multiple examples of the problem. The prior suggestions of turning off email address and showing User entry name only does not really solve the problem when I am unable to modify an address that is not actually saved in the Address Book. I have also tried multiple times deleting Thunderbird and the related entries for IMAP mailboxes and abook.mab address books. I even rebuilt the entire mailbox to see if that would help. Nothing worked.

This was a problem some time ago, and then it disappeared and now it has reappeared again. Assistance from the expert users of Thunderbird would be appreciated.

My version of Thunderbird is 142.0 and I am using the Windows 11 Operating System.

Yours sincerely, Mansoor IJAZ