Thunderbird Community Forum

Hello. I have been unable to send email from one of several POP accounts on Thunderbird (v 115.18.0). I believe this occurred after Network Solutions changed the SMTP server for that email account. I am able to send email from my Gmail IMAP account setup on the same Thunderbird program on my PC. I have tried all the port and authentication settings for SLS/TLS and STARTTLS, changed/updated passwords, etc. I do not get any error messages, just never receive the test email I send to my other accounts. I updated the SMTP server on my iPhone mail app to the new NetSol SMTP and it works on that platform. I just cannot get it to work on Thunderbird on my PC. NetSol support said to delete account and start over which is not possible as it is my business email account. Also, the inbox is too large to back-up to an external drive. Any suggestions? Thanks in advance. John

I always train the junk filter by marking mails that are erroneously sent to the spam folder as "Not Junk". They are transferred back to the Inbox as one would expect, but after a few minutes some (not all, but most) are again moved from the Inbox to the Spam folder. This happens repeatedly every time I mark these legitimate mails from addresses that should not arouse suspicion anyway, such as theguardian.com (an address that is in my address book, so should be whitelisted anyway) or Arri.com, just to name two current examples. Why is Thunderbird overriding my "Not Junk" flag? How can I train the junk filter if Thunderbird ignores this? Is there something in the Settings I'm missing?

I use a number of add-ons to help me out. Unfortunately, the following add-ons aren't working right now: Quicktext, Send Later, TbSync (where and how do I integrate it into Thunderbird?). When sending an email, I have to go through “File” > “Send”—there’s no button for it. The VBA call to send a generated email truncates the string, so the attachment isn’t included.

I’m sure some add-ons will be updated. But this is hitting me hard right now.

My recollection is that prior to a recent automatic update to Thunderbird 140.12.1esr (64-bit) when I had a message composition window open, there were "SEND" button and possibly a "SEND LATER" button (to the left of the addressee and cc addresses in addition to the keyboard shortcuts (CTRL ENTER and CTRL SHIFT ENTER).

Following the update, there is no longer anything to the left of the addressee information. I have checked the toolbar menus, and there do not appear to be any button options. I can still send messages, but the lack of the buttons is a hindrance.

Most of my buttons have disappeared except the send button, which doesn't work. Online help is confusing or doesn't fix the problem. I'm ready to move to a different platform. Why is this so difficult?

I tried the Toolbar fixes in this forum and got the menu to show up, thank you. (Any menu in Compose mode had disappeared. Actually, both Firefox and Thunderbird icons on desktop and Taskbar had disappeared as well, and I had to reinstate shortcuts. This may or may not be pertinent.)

But when I try to add "Send" to the menu, using customize, the "Send" icon is nowhere to be found as an option, so I cannot add it to the Toolbar in Composition mode. "Send" is grayed out in all bold textmenus. If I use Ctrl-Enter, message does get sent. Using Windows 10, still. Perhaps this is an upgrade issue?

After updating to 153.0.1esr(aarch64). the SEND button has disappeared. There's no way to send an email. (I can receive emails.) I am a Mac mini M2 Pro. OS 26.4.1

I cannot find a link to download a previous release of Thuderbird, which was working fine until this update.

Hi, I have 2 Local Folders and an additional Local Folders1 folder. I need tol remove two of them so my Msg Filters work properly. Do I need to edit an additional file inn my Proffile folder? Need some guidance please. Am I not following rules and guidelines? Thanks

Disabled in a nursing home.

Been using Thunderbird for a number of years but recently the SSD on my laptop became corrupted and I had to buy a new one and install TB and restore my profiles from a backup.

I have two accounts and switch between them with Profile Manager.

The new laptop is an ASUS Vivobook with Win 11 Home and although TB runs ok the first time, if I close the current session and try to open the other account, nothing happens when I click on TB icon on the taskbar. IF I wait for around 5 minutes then it will run

Checked in Task Manager and cant see any instances of TB running, so any thoughts on what's wrong. Does not matter which order I open the accounts.

My brokerage firm states that it cannot notify me via email for conformation transaction. How do I add this firm's domain to my address book so that its emails will be received my me?

I am encountering a message of "The installation seems to be incomplete. Please check your hardware and disk setup and/or re-install." when trying to run Thunderbird.

This first occurred on a system that had been working for a while. An update may have been installed.

Here's what I've tried. -

Uninstall Thunderbird (along with Firefox and Mozilla Maintenance.) Checked for Program Files/Mozilla folder (all were removed). Run SFC / Scannow Run CHKDSK Installed pending Windows update. Restarted the System Renamed (essentially removed) Profiles folder Turned antivirus software off Downloaded and installed the latest version of Firefox, then Thunderbird. Launched Thunderbird. Still received the same error..

Any ideas on how to resolve the issue?

OPERATING SYSTEM Windows 10 Professional (x64) Version 22H2 (build 19045.6466) System Model : HP HP ProDesk 600 G3 DM SYSTEM MODEL HP HP ProDesk 600 G3 DM Enclosure Type: Mini PC PROCESSOR 2.80 gigahertz Intel Core i7-6700T 256 kilobyte primary memory cache 1 megabyte secondary memory cache 8 megabyte tertiary memory cache 64-bit ready MEMORY 15.88 Gigabytes Usable Installed Memory BOARD HP 829E KBC Version 06.29 STORAGE 4.51 Terabytes Usable Local Storage Capacity 3.59 Terabytes Local Storage Free Space

• Waterfox - 6.6.12 (64-bit) • Thunderbird - 140.13.0esr (64-bit) • WordPerfect 12.0.0.602

======================================================

MESSAGE:

“Your email ***.net and data has been hacked. . . . The Trojan virus gives me complete access and control over the device you are using. As a result, blah, blah, blah, blah . . . “

I rather doubt the veracity of this, seeing it includes “I can see the full list of your contacts from your phone and all your social networks” — since I do not access the Internet from any telephone.

It has been several years since I’ve received something of this sort, so have remained confident that my system(s) remain well-protected. However, since the message did arrive in one of my email accounts, is there still the potential of my contacts list(s) being compromised, and, if so, how to safeguard against that?

Many thanks. Appreciated.

My Mac last night lost thunderbird (and numerous others things) and it's setting itself up again. I get an error that smpt already exists and I can't go any further! What's going on? Using Comcast Mail.

I had a working thunderbird/gmail connection until my main drive went to SSD heaven. Yes, I have current backups but I took the opportunity to move to a Win 11 box so all my data is safe but might be in different places.

I can log into gmail but can not configure thunderbird to do that. The Account Hub does what it is supposed to and all is well up to Password question. The gmail password does not work and I can't remember ever giving thunderbird a password. My mozilla accounts all refer to a domain that I gave up 5 years ago,

Any suggestions would be very appreciated.

Please answer with a copy to [redacted] as I may not have access to [redacted emails from public community support forum] -bill

Since about November 2025, all the mails I try to sent to @sfr.fr addresses (different recipients) fail and I get the following message: Sending of the message failed. An error occurred while sending mail. The mail server responded: <xxx.xxxx@sfr.fr> recipient domain rejected (blacklisted by local policy).

Please check the message recipient "xxx.xxxx@sfr.fr" and try again

I did not have this problem before. If I use Greenby's web mail (My email provider ), the messages are sent without any problem. I would very much appreciate some help to solve this problem! P.Y: pemy@pemyoung.plus.com

I have followed the instructions that several people give to transfer my existing Thunderbird installation to a new computer where I have just installed Thunderbird. That is I copied the Thunderbird folder and put it in the Roaming folded found in %appdata%. Both computers are on Windows 11. When I open the new Thunderbird, it does not recognise it. Furthermore, in Help>Troubleshooting information>Profile folder when I click to open the folder, it looks for a folder that is not in my previous Thunderbird installation: qr19mupe.default-release instead of the one that came with my imported Thunderbird folder. Has this happened to anybody and found the solution? Can anybody help please?