Thunderbird Community Forum

This is the message I get when I try to send a message. Sending of the message failed. An error occurred while sending mail. The mail server responded: <budguinn@charter.net> sender rejected. Please verify that your email address is correct in your account settings and try again.

I have included a screen shot of my server settings.

I reported this to you by last Friday but I have received no response so far. After reporting to you, I tried all possible trouble tests and checks, then took following steps. 1 - I deleted my copy of Thunderbird from my PC 2 - I loaded a new copy of Thunderbird - all went well 3 - But situation remains, the program opens, reacts very slowly to commands but I can not get into any functions. Thunderbird does not show any emails, nor can I read older emails stored on my computer 4 - I ask you kindly for speedy help, my email function is fully down. Yours - Jarl Jaatinen - Finland

I'm currently making a custom theme for Thunderbird for my own personal use. I've gotten pretty much everything how I want it to look – except the main content. I prefer light mode for accessibility, and currently it's stuck in dark mode everywhere (my settings menu, calendar, mailbox, etc).

The first image is how it currently looks, and the second is how I want it to look (the black boxes are there to block sensitive info). What would I need to add/edit in my manifest.json and/or style.css to get there?

Some of the messages in my inbox show the wrong information in the "from" and "correspondents" columns. Is there a way to get the correct information from the message to be displayed?

I want to configure an automatic response to emails that have been forwarded to me from a particular address. I have created a template for the response and it is saved in the Templates folder. I then attempted to create a Filter Rule to send the response. I believe there should be a Reply with Template option in the Perform these action pull-down, but there isn't. I've attached a screen shot to illustrate this.

I'm using Thunderbird 154.0 and Windows 11. Is there a new way of achieving my objective?

I had to recently change my password on my shaw email account. Now thunderbird won't download my emails. I changed the password in the account settings to match the shaw email account password but I keep getting an error message: "Host contacted, sending login information..." and then after a long delay the error message reads "Login to server pop.shaw.ca with username ... failed". Any idea what I'm doing wrong by simply changing the password? I think this happened before and some wonderful human on this forum told me I had to put something before the password or click/unclick a particular box, but I can't find that old answer to my previous question. Thanks in advance for any help someone can offer!

The 'new' Thunderbird doesn't allow a password entry in server setup and will not prompt me for one. It pops up a Windows toaster message saying it can't connect - obviously. I set the advanced options to not remember the signon but still no success.

A few days ago I sent emails and did not see the usual "Saving to Sent (IMAP)". Instead it said something like saving to Sent folder. That's fine, but the emails didn't appear in my Thunderbird Sent folders. I downloaded Thunderbird to see if my version was obsolete. Still no emails in Sent folder. The internet said I could delete my Sent folder, and Thunderbird would re-establish Sent folder. It did not. I can still see my old emails in my Local Thunderbird sent mail, so I deleted about 100 old emails in case the folder was too full. Still, the new emails I was sending did not appear. I checked with a few recipient people and they told me the email go to them. I have tried all the "solutions" I can find. What else can I do to see copies of my outgoing emails.?

I have had Thunderbird from the time I acquired my Mac computer. This week it started to do something new. After a restart I opened Thunderbird. A box came up that says across the top System Integration. The cursor balloons, and hasn't stopped for the time I powered the computer, as least fifteen minutes. You know how the program icons are in a dock across the bottom. With other browsers open, hitting the Thunderbird icon doesn't bring its window into the forefront. This needs either a reset, or possibly a backup first. Is there a quicker way to fix this? Thanks in advance. I am not using a VPN; but I also have Thunderbird on my Windows 11. You might have seen a more recent thread on that installation. I included a screenshot. It was easier here to do that than on the Windows 11. On the Mac, I just had to use Activity Monitor to close out of Thunderbird in order to get its version.

Ever since last maj, windows are no longer resizable. Same Thunderbird version works OK on my laptop running Debian 12, but I cant easily upgrade version Debian 11 to debian 12 on this older desktop, so I wonder whether I could possibly de-install v140.13.0esr and re-install an older version, if then, which one would be suitable and available. If not, is there another trick to resize windows on v140.13.0esr ? Thanks in advance for your help.

Every 10 minutes, your Thunderbird app generates an attachment (nmsa) that McAfee deems a Trojan and quarantines it. I get 15-20 popups from mcafee every hour. If I close Thunderbird it stops. What can i do to stop this from happening?

Trojan:Win/SuspiciousAttachmentScript.a

C:\Users\ken_s\AppData\local\Temp

Back when W110 went to w11 I got a new computer and was given great directions here to back up my TB profile by searching %appdata% and copy the thunderbird folder to external source. That file is 198 MB. I do this every month now ..It is my understanding it saves my profile and all emails including local ones. Now in Aug 2026 when i copy this file, I am getting an error a file is too long and have no choice but to skip that file..I will attach a pic of the error. Is this back up ok to use or is it corrupt because of the error?

I also found in TB help there is an export feature in TB to a zip file but that .zip is huge..I did one just in case. I think you just open TB>select hamburger menu three lines on top right>tools>export. I did that back up/export also today and that is a .zip file folder that is less properties like 175 MB.

So now which way is the correct way to keep a safe copy of my TB in case my computer crashes or i have to put on another pc?

I have forgotten my password and even my username in Thunderbird mail. When I try to get a new password, they send it by email. Since I cannot get into email I do not get the code. I want to completely remove my account from the server so I can start fresh. This takes me to username and email + password. I enter the new details and the server having not deleted my account sends, "Incorrect email or password. This is why I want to delete it completely so I can really start a fresh setup. I am using Ubuntu 2404.

Thank you for your help.

Rod.

Jeg har brugt Thunderbird gennem mange år. Nu har Norlys besluttet at lukke Stofanet mailserveren. Min nye internet forbindelse "Fællesnet" har ingen mail server. Hvilke frie mail servere kan bruges sammen med Thunderbird. Venlig hilsen H. P. Elmer

My old Widows 10 computer died. All I have left of it is the last full Acronis 2020 backup. I have installed Thunderbird on my new Windows 11 computer and want to restore my Profile data from the backup. How do I find them? Have been searching for days and can't find anything like in your profiles help article.

If I can't recover the data can you at least send me my current license key?