Thunderbird Community Forum

Ever since the latest update, when I hit send for an email. It says it cannot send, I cancel, hit send again and it goes through. I have to try sending EVERY email twice.

Clearly, this is a very basic question which has undoubtedly been answered before, but I haven't been able to find it. If Thunderbird had an old-style Help feature with an index, I could probably look it right up. But coming to the forum is the only option the program gives me.

I've been running TB for 10-12 years, generally with no problems. When I logged in on 5/13/26, I saw that Windows had run an overnight update:

    2026-05 Security Update (KB5089549) (26200.8457)

Thunderbird (version 147.0.2.0) was not running, although it had been when I slept the PC the previous night.

Now, when I try to start TB it gives me the crash report dialog. Selecting the Restart option just brings me back to the crash report.

In searching for possible causes, I see that this may be caused by a bad profile. So I open the profile folder with (run) %APPDATA%\Thunderbird\Profiles\ which in my case is:

  C:\Users\<user_name>\AppData\Roaming\Thunderbird\Profiles

This is an empty directory. But if I go up one level to \Thunderbird there is a profile.ini file which contains (actual user ID replaced by <user_ID>:

[Install8216C80C92C4E828] Default=E:\Thunderbird\Profiles

[Profile0] Name=<user_ID> IsRelative=0 Path=E:\Thunderbird\Profiles Default=1

[General] StartWithLastProfile=1 Version=2

"E:\Thunderbird\" is the correct location of my TB installation. In that directory is a profile.ini file that contains:

[General] StartWithLastProfile=1

[Profile0] Name=default IsRelative=1 Path=Profiles/<user_ID>.default

Directory "E:\Thunderbird\Profiles\<user_ID>.default" is present. But all of it's files are dated 2010 except Mail, dated 2016.

Directory "E:\Thunderbird\Profiles" contains the ImapMail and Mail sub directories totaling about 25GB data.

I don't know what the Thunderbird startup process is or if this all looks correct. Can someone give me a sanity check? If this looks normal, what else could be corrupted?

Thanks in advance.

I just installed a new router and all of a sudden nothing is working properly on my PC. Among other things, I need to fix Thunderbird, and for that I need to find where my thunderbird profile is. The instructions I've seen say to go to troubleshooting information, find profile folder, and click on "open folder." When I do that, nothing happens. (I told you installing the router appears to have broken everything--I don't know how that happened, especially since I was on the phone with tech support for the router for install), and I'm no closer to finding the profile file. I can enter %appdata%\roaming\thunderbird\profiles but that shows me two different profile directories and I don't know which one is the right one. How can I find the correct file and why doesn't troubleshooting information just show me that?

I have been unable to send emails for several weeks and keep getting the following error message: sending of message failed The message could not be sent because connecting to the outgoing server (SMTP)smtp.1und1.de failed. The server may be unavailable or is refusing SMTP connections. Please verify that your outgoing server (SMTP) settings are correct and try again.

My settings have not been changed so I am wondering what has changed and how i can correct it. My computer knowledge and ability is very limited so please bear theis in mind when offering advice and solutions. Thank you.

Every time I log in and then every so often afterwards I get the pop up - you are about to override how Thunderbird identifies this site- for a now deleted mail.co.uk account. I have tried all the fixes suggested by Google but it still keeps happening and is driving me mad. It tells me the certificate is outdated or invalid and asks to confirm to permanently store the exception but just keeps coming back every time I click on confirm, it only goes away if I click cancel but then keeps coming abck.

Recently, I have experienced an erroneous browser launch, simply by clicking on the title of the message in the list pane. This problem seems to occur when clicking on emails from a particular UK supermarket (tesco.com) and the web page opened has a long and complicated URL, but the page contains only a single pixel which shows up as a white dot on a black background.

Obviously, it is likely that there is something strange about that source, but the problem doesn't occur if I click on the same email in a different email client (in this case Evolution).

I have tried various Settings as advised by web searches and also the solutions suggested in Thunderbird Help (Troubleshooting Mode and Troubleshooting Information).

I am running Thunderbird 140.5.0esr (64-bit) on Kubuntu Linux 24.04.

Does Thunderbird use an internal PDF print driver? I can't print PDF attachments in color from an email. I've checked my print settings but Thunderbird only prints black. If I save the PDF file and then double click it, Adobe comes up and prints it full color. I'd appreciate it if it can brought to soneones attention.

Thank you.

I can see that there has been a reply or a messages was forwarded and when I right click for the menu "Open" may not even appear at times. When it does appear "Open in Conversation" is not always presented as an option even though there has clearly been conversation as I can locate reply's in the Sent folder. Sometimes it's there but when selected it opens a tab that only shows the email and none of the conversations. It's hit and miss and I can find no rhyme or reason. Any help would be greatly appreciated. Also, I would love to Testflight Thunderbird on Apple. Thanks, Sue

I have recently installed Thunderbird to help me with my overfull Yahoo account. I installed it using the default Yahoo authentication which seems to work fine. Since Yahoo exposes at most 100,000 messages in any one mail folder, and my inbox had over 250,000, my goal is to spread those out amongst a few different folders so that I can manage the inbox more effectively offline. To that end, I set up a couple of saved search folders, each of which selects e-mails within a two-year date range. Incidentally, each only selects about 1,000 messages at a time, not the 40,000 or so each of those time periods seem to contain. When I use my Ctrl-A shortcut to select the messages in one of the 'search' folders, then move those messages to my Yahoo mail folder under my e-mail account, the messages initially are wiped from the saved search folder, but after a few minutes they all return!

Incidentally, the saved search folder has the same name as the folder I'm trying to copy the messages to, but the search folder is under the Inbox, and the other folder is 'beside' (not under) the Inbox.

Let me know if there is a more efficient and effective way of doing what I want. Ultimately, I want well under 100,000 messages in my Inbox.

Thank you

Drgan Maric, 74, Belgrade, Serbia. This is my self-taught English.

I use Thunderbirad for years, including small donation when I start to use it. Since a few days I can not open WebMail from cPanel of Namecheap,

Nothing is changed in both servers and ports. In Account Settings Outgoing Server has an option to TEST connection for server. Result failed.

An Attachment is an immage of TEST and RESULT FILED.

In this age, with broken spine and almost immovanle, it makes me very frustrated. Coud you plase reaolve this issue and make Thunderbird to work properly and peace in my mind,

Hello (this might fit better in "performance & connectivity?): Tbird 140.10.1 & .2 esr. W11p laptop v23. As of tonite (15may26), after update from 140.10.1 to .2, in a message, the "buttons" for a web link no longer appear, in the msg body. Instead the link is shown in full. How can I fix that?

Here's an example (others are longer) from our local rag "Press Democrat."

Header Logo <https://enews.nl.pressdemocrat.com/q/ qH1rRJrBKJ0Xyf9LNp1wEwHDTif8o4tQ5y1ZcOJcHNsZGRhQGdtYWlsLmNvbcOIyz_GZ83be6bPLq- ZFHTNYUc43xg>

I also closed & re-opened tbird, did NOT reboot laptop. Problem remains.

Thank you.

I have created a new gmail address for my wife. Would like to add this address to my existing Thunderbird Mail account so that her emails also come to my Thunderbird email account. Not sure how to add her address to do this.. Thanks

Hi,

I am unable to get Thunderbird to work after my microsoft password was updated. I get the popup & enter my email & new password, but I never get the second popup to accept permissions. It just doesn’t go any further. I can see Failed login attempts for TB on the microsoft side. I am not too tech savvy, so I’m doing my best to troubleshoot!

This is Thunderbird 78.14.0 on mac 10.11, YES, that is old, it is a legacy mac! It was successfully setup with OAuth2 over 3 years ago & worked fine until the password update. I was able to add TB to an old 10.15 mac & it got the permissions popup & the account was added fine (but it is also using TB 150.0.2). Oddly, there was no 2FA prompts given, it just connected with my password only??

I had a number of devices that needed passwords updated, so I’m wondering if there was a conflict when trying to do this one? Do I need to delete certain files? I found where to delete the stored passwords & did that, but it’s not moving past that point to even store new ones & connect. I can’t grant permissions?

Also, I notice the successful TB login activity shows my IP address, whereas the unsuccessful one shows Browser Mozilla Firefox. I’m not sure if that helps with troubleshooting or not!

Thank you for your time!

I had TB on my desktop for years and finally got it also synced to my phone. Then with a failure with Windows 11 had to wipe clean the desktop and start over. Cannot reinstall TB. I obviously have the correct e-mail and password as I was able to log into Mozilla and submit this question. I believe it is a problem with my user name and what is on my phone setup does not work with my desktop reinstallation.

I'm a longtime Thunderbird user. Today, it stopped working to send messages. (I can still receive messages OK.) When I try to send, it does the spell-check, but then doesn't do anything. The message remains open but unsent. In case it's helpful, my account info says IMAP mail server, SSL/TLS connection security, OAuth2 authentication,

I have new e-mails from some company. I can search for the company and the e-mails show up (as recently as today) but in the list I only see e-mails as recent as 35 days ago. I see TB periodically download new messages but they don't show in the list. I have searched all over for a solution and nothing has worked. I have no Message Filters and I have no Quick Filters active. I have tried both repairing and compacting the Inbox. Does anyone have anything else I can try?

I would appreciate detailed instructions on how to transfer emails currently in my "roundcube" email account to my mozilla thunderbird emal account (I would like to have my old emails transported to the mozilla account).