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Thunderbird changes the from email AFTER email sent so user sees email from wrong sender, This since recent update. I have used Thunderbird for many years and have never had this issue before. I've tried fixes on the internet but they don't seem to work.

On my PC Thunderbirds sending/receiving mail says the mail server refused my connection. My laptop works fine. I have duplicated my laptops in/out specifications onto the PC but still nothing works. Spectrum says everything on their end is fine but can't vouch for roadrunner who is the rr in my mail address of ca.rr.com. All this started about 4 days ago. Any ideas on what to try next? Thanks.

Hello:

I use Thunderbird for work. I have several email accounts configured in it, including Gmail, my company's email, and Outlook. I recently added a new Outlook account, and I haven't been able to send a single message. The error I'm receiving is the one described in the title. It's worth noting that I have another Outlook account working perfectly. I've tried every solution I've found online, and none of them have worked, including enabling SMTP in the account settings, making sure OAUTH is enabled, using smtp.outlook.com or smtp.office365.com instead of smtp.mail.outlook.com, enabling two-factor authentication, changing my password multiple times, etc.

I just upgraded (reluctantly) to Win11 on my desktop, and my POP Thunderbird account did not survive the upgrade. I had to switch over to a new IMAP Thunderbird, losing all of my POP folders (which are still on my disk). Just not, apparently, accessible.

Anyone have info on how to re-access or somehow get them into my IMAP install?

My thunderbird email is broken and I cannot interpret the error message. I found a similar problem at https://support.mozilla.org/en-US/questions/1281109, but I have not been able to follow the solution.

The error message is:

Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) promail.ptd.net failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.

When I access my email at ptd.net, using firefox, I can make a full connect. But I cannot connect to email using Thunderbird, which is my preferred email tool.

My hope is to have a dialog in this thread with someone who can walk me through the steps to get thunderbird working. Can someone help?

Jim A

good day....ii hope someone can help. the other day i was accessing my yahoo account spam folder and by accident, i deleted the spam folder instead of emptying it. the spam folder is now sitting in the trash and i'm unable to remove it from there. when i log into my actual yahoo account, the spam folder is where it's supposed to be and not in the trash. i tried removing the yahoo account from thunderbird and reinstalling it in hopes that it would rectify the problem, but it hasn't. does anyone have a solution?? i would greatly appreciate any help you can offer. thank you for your time...mike s

My old email server was Mediacom (mchsi.com). I had that email account plus a gmail account on Thunderbird. Sometimes people said their emails to my gmail account would bounce. I changed email servers and no longer have the mchsi.com email or Mediacom server and have 2 gmail accounts on Thunderbird. The new one works fine. When I send an email to the old gmail account it bounces back saying "address not found. Your message wasn't delivered to ------@mchsi.com because the address could not be found or is unable to receive mail. 550 5.1.1 I had the tech that sold me the PC look at the settings on Thunderbird for the gmail account and he said they were okay. Where else can he check? Somehow the pc thinks that just that one gmail account is run through or attached to mchsi.com Kathy foggiak@gmail.com

When I accessed TB it updated to an ESR (Eclipse) version and when I load it I get a message saying I've used an old version, would I like to create a new profile. ( I didn't) I've copied my backup to the profile but many folders are missing from the current profile.

How do I get all my folders to display? I've reinstalled TB version 147 without the ESR option.

I'm on latest T-bird 140.7.0-ESR 64-bit. I have random failures when trying to move individual files or folders from LOCAL FOLDERS back to MAIN emails. Moves some, sometimes, then won't move, or will move some but not all, and often corrupts the files back into Main folder. I only use one email under T-Bird. This has happened for years, but I have been judicious about moving files and lived with it. But it's still a problem that I would have thought something like this would have been fixed long ago? .The formatting of LOCAL FOLDERS & FILES in LOCAL FOLDERS seems different & convoluted vs. a straightforward formatting in MAIN where I can easily move withing Microsoft file management. But trying to reconfigure and COPY or MOVE Files or Folders from LOCAL is very problematic.

Hi! I am trying to use the Thunderbird application to help me view a huge '.mbox' file from an email account that is no longer active. I have the entire file saved to my computer as I downloaded it before the account was closed. Can you help me access those files? I am working on a huge project and really need to look for date sand times of emails sent in the mailbox so that i can piece together the timeline of the project. I would greatly appreciate this!!!

1. I've drafted an email, then hit save / closed the email and opted to "save changes". 2. I try to edit that email, but it is just "flashing" in the preview screen. I right click on it to "edit draft message", but that just brings up a blank email. 3. The status in the bottom left of the screen shows "loading message..." "downloading message", repeatedly. 4. It was working fine earlier in the week, but Thunderbird Desktop Version 140.7.0esr | Released January 13, 2026, seems to be when the problem started?

Just installed TB 147 under Windows.

Previously, there was a menu item File/Compact Folders (plural).

It is now (at least on my machine) replaced with File/Compact Folder (singular), which only compacts the currently active folder. I cannot now find a way to compact all folders at once.

What am I missing?