Thunderbird Community Forum

When I send a mail with FileLink, I get the message: "The message could not be sent. An error occurred while sending the email. The server responded with: “Spam message rejected.” Please check the message and try again." (actually, in French: "L’envoi du message a échoué. Une erreur est survenue lors de l’envoi de l’e-mail. Le serveur a répondu : Spam message rejected. Veuillez vérifier le message et essayer à nouveau.")

I made different tests:

• change email source (so, change SMTP server): it worked - but I do not want to change the standard SMTP server of the initial email address
• after the first error, the attached file, which is a shortcut to the big file, can be suppressed, and not the link in the body of the message ; sending the message is accepted

So, I suspect the spam filter to refuse the "attached shortcut".

The question: Is there a way to configure the FileLink feature so that it does not attach a file, but just add the link the body of the message?' Or are there other neat workarounds?'

Hi there, it seems I'm suffering from the same problems as others in several countries. I have also not been able to access my gmx.com account via Thunderbird for about a week now. I live in Belgium and use a Proton VPN, in case this is relevant. I can't find how to delete cookies in history, nor any other potential solutions to the problem. Any help offered is greatly appreciated! Best, Doreen

hello, i cannot seem to find a solution online, hopefully someone can help.

i often receive emails with images attached, and most of the time people don't resize their images. you can imagine over time this all adds up in the email storage folder total size.

i dont always need to keep a 6mb image version, it can be reduced after i am done.

i would like a method to resize the received emails image attachment, to at least still have a smaller copy for refence, but not end up with a huge thunderbird email account profile (in the email received not externally saved)

preferably a one click solution, or even a routine i can run on the file system, etc. or some way to edit the received email and its attachment in program.

thanks

I'm Using Thunderbird version 148.0.1 (32-bit) on Windows 10 Pro I currently have 2 email accounts in Thunderbird...a Gmail account and a private account linked to my own webpage account. Both these accounts are working very well and I encountered no problems when I originally set them up some time ago....... However.. I am trying to add an additional email account. a Live .co.uk account I enter my Full Name and email address "xxxx@live.co.uk" as requested... I enter my password for this account and in my "Your Login" details ( the characters "xxxx" before the @ in my email address) I then select "Continue"........... Response : "looking up configuration...." Then.... Authentication failed. Please check the username and password...Exchange auth error I know I have entered the correct username and password for this account... and the account works fine on my mobile phone email app. using the same username and password..... No matter how I try, I am unable to set up this existing Live mail account so that I can access it in Thunderbird...... along with my other email accounts in Thunderbird, which are working OK.... Any suggestions as to how to fix this annoying problem, would be really appreciated......... Thank you

The arrow is tiny and hard for me to see (as well as the vertical bar for selecting text). In other programs it is quite large. I have the LXQt cursor size set to 60. How can I increase the size for TB? How can I make it invert color so as to have good contrast always?

I have been using Thunderbird for a fairly long time and have several email accounts in it. Today, I noticed that one of my accounts seems to be filtering the messages for one type of message. When I login to the email account directly, I see all of the messages. I don't have any filters set - none of the filter buttons are on, there is no filter in the filter text box and there are no filters in Tools->Message Filters.

I have been using Thunderbird with two POP3 Hotmail accounts for some time and I am trying to set up a third account with exactly the same configuration. However, both the automatic and the manual configurations failed. The new account receives mail, but the outgoing smtp server config seems to have a problem. Sending messages times out or keeps prompting for a new password.

The Hotmail account has POP3 and IMAP enabled. Thunderbird is set to receive all cookies. I cleared history and cache after every attempt and also temporarily disabled the firewall.

Any suggestions about what the problem could be?

Thunderbird version number: 148.0.1 Mail provider: Yahoo Client OS: Windows 10

The issue and steps I tried to resolve: On 1 Jan 2026 I switched from Outlook client on my Windows 10 PC to Thunderbird 146.0.1. I did not import any user data from Outlook but started with a clean install of TB for the new year. I use yahoo.com with POP3 as my email provider. Server Settings: Server Name "pop.mail.yahoo.com", port 995, SSL/TLS, OAuth2 Outgoing Server: Server Name "smtp.mail.yahoo.com", port 465, SSL/TLS, OAuth2

it all worked fine and I was very happy with the setup. Then from early to mid-February I was unable to use my computer. When I finally accessed Thunderbird again, it connected to Yahoo and showed that approximately 800 email messages would be downloaded and started downloading them. After downloading about 100 messages, Thunderbird timed out and I haven't been able to get it to work since.

I have read and followed or tried to follow these articles plus others that I may have forgotten about (not listed in any particular order) - OAuth2 Authentication for Yahoo, AOL and ATT | Thunderbird Help - including all the steps in Please check the following before asking for support - POP access settings and instructions for Yahoo Mail | Yahoo Help - Automatic Account Configuration | Thunderbird Help - Manual Account Configuration | Thunderbird Help - Thunderbird and Yahoo | Thunderbird Help - Send and receive messages in Thunderbird | Thunderbird Help - Can no longer get emails | Thunderbird Support Forum | Mozilla Support - Emails suddenly stopped downloading to Thunderbird 140.2.1esr | Thunderbird Support Forum - Get Messages | Thunderbird Support Forum | Mozilla Support - Cannot receive messages | Thunderbird Help - Problem with Thunderbird working with Yahoo Mail acccounts. | Thunderbird Support Forum

I have removed all messages from the Yahoo inbox and tried to find one or more messages that may be affecting the download. I don't know the best way to determine that.

I use Windows Defender for my antivirus. I don't see anything in Defender that blocks or scans email messages which would prevent downloads, although I could be wrong about that. if this might be the issue, please provide some guidance about how to check Defender.

I have uninstalled and re-installed Thunderbird. In the process I downloaded the setup file for Thunderbird Setup 148.0 and installed that version. It later auto-updated to 148.0.1. Before installation, I removed all external connections from my Yahoo account and completely removed Thunderbird from my PC, including the profile and profile.ini. When I reinstall and switch the account to POP3, Thunderbird captures the App password from Yahoo and connects just fine. But it still times out while attempting the first download of a message. The first several times it timed out, an error message was displayed but now it doesn't show anything. Except no messages are downloaded.

At this point, I don't know what else to try. Since I don't have much experience with Thunderbird, I don't know how to troubleshoot the process (logs to look at, etc.). I don't want to go back to Outlook but I need the email client to work and download messages. Any help would be much appreciated.

ThB & cPanel filters (a) don't catch all SPAM and (b) send legitimate mail to the Junk folder. Together, the 2 problems cause a large amount of work. Because of (b), I must regularly go through the Junk folder. Because of (a), the Junk folder contains a huge number of messages. (a) Messages from serial spammers trying to spoof Costco, Marriott, AAA, Blue Cross, etc. that I have flagged as SPAM dozens of times IN ALL THEIR VARIATIONS, still appear both in the Junk folder and in the Inbox (including messages with the red SPAM marker turned on, which to remove from the Inbox I must first click to mark them as non-S{AM, then click again to mark them as SPAM). (b) Messages from senders who have sent hundreds of messages before that have gotten through and who are in my contacts list regularly and in significant numbers end up in the Junk folder. I tried to set up filters in Spam Assassin. They made no difference. I tried to set up e-mail filters in cPanel, which entirely removed messages before they even reached ThB. These were quite effective, but although I created them very carefully using regex to capture every variation of COSTCO spelled with Os and 9s, etc., they also ended up removing legitimate messages (and none of my senders mentions AAA or BlueCross in their messages). I really have no clue how to proceed. None of the advice that AI or ISP support provided helped. Thank you for taking the time.

Thunderbird causes my machine to 'hang' from time to time, often for up to a second and usually a number of times in quick succession on each ocasion. Sometimes this happens frequently - say every 5 or 10 minutes - sometimes only after an hour or more since the past occurrance. My machine hangs completely - nothing will work, mouse, keyboard, sound, other apps etc. If I happen to be typing (into any app - including Thunderbird - when this happens, input ceases, the cursor freezes and - if the problem persists for a second or two, Windows reports "[app] is not responding" I cannot be certain, but I believe the problem occurs whilst messages are being retrieved.

This is a very serious problem as it means that I can never leave TB running as the problems it causes are not acceptable. This means I cannot deal with incoming messages without periodically re-starting TB - which is an utter PIA.

I am running Win 11 Professional on a 2-year old machine with 64 Gb of memory. I have run TB in Troubleshoot mode, I have confirmed that the problem occurs regardless or whatever other apps are running (or none) and I have proven conclusively that no other app causes any kind of similar problem.

Looking forward yto hearing if others have had the same issue and what can be done about it.

Hello.

I just installed thunderbird for the first time and i really liked it but there is a problem some of my emails particularly from from Fiverr don't show Fiverr logo at the top within the email maybe that logo has linked wrapped in it on which i can click and it take me directly to my fiverr profile. These are official emails from fiverr. What i have tried: I tried every possible solution that i can get on internet. Show Remote content turning on and off, Turing Simplified view on and off. Turning of the Proxy from auto detect and Turning the DNS off. Fiddling around view settings. Changing settings in Configuration like mailnews.message_display.disable_remote_image, browser.opaqueResponseBlocking.javascriptValidator, browser.opaqueResponseBlocking, etc. But it didn't load the logo image and keep showing broken image place holder. This is also the case with my bank mail, my bank email sometime have an image with warning about OTPs not just text it also don't load. I also tried disabling the spam protection and i only use minimize to tray extension which i disabled to check if image loads or not ans tried to run it in Troubleshoot mode but no luck. I will really appreciate If anyone could help me and fixed the issue . :)

Thanks.

I can't seem to get Thunderbird on Linux Mint to work. Everything font related is a mess. I don't know what default Thunderbird uses when it doesn't know a font but the setting is unreadable. I've messed with a ton of font settings but nothing seems to change anything. Note if I copy the garbage and paste it into a notepad, it is totally readable but there appears to be no way to change this default in Thunderbird. Please help.

Before I recently (& reluctantly) upgraded to TB 140.8.1esr, I used to be able to paste the following in the Error Console to get a URI for an email message (or template) that I wanted to access from my calendaring app (EccoPro -- yeah, I know, one of those "from my dying hands" things, but it has never been equaled much less surpassed, just choked in the cradle by MS Office).

var hdr = gFolderDisplay.selectedMessage; alert(hdr.folder.getUriForMsg(hdr));

I would highlight the message I wanted to use, hit Shft-Ctrl -J, and paste that in the console.

I would get a notice with something like this which I could copy

"mailbox-message://nobody@Local%20Folders/Templates#10"

I could then put a clickable link in my calendaring app to run

"C:\Program Files\Mozilla Thunderbird\thunderbird.exe" -mail "mailbox-message://nobody@Local%20Folders/Templates#10"

That message would open. Then I could hit Ctrl-E to edit it, paste as needed, and send .

This worked very well. I did not come up with it. I struck gold with Google and just copied it. With something similar to AutoHotKey I was able to automate it.

Now those URI codes no longer launch at all, and I cannot get new ones because when I paste

var hdr = gFolderDisplay.selectedMessage; alert(hdr.folder.getUriForMsg(hdr));

into Error Console I get

Uncaught ReferenceError: gFolderDisplay is not defined
   <anonymous> debugger eval code:1
   getEvalResult resource://devtools/server/actors/webconsole/eval-with-debugger.js:306
   evalWithDebugger resource://devtools/server/actors/webconsole/eval-with-debugger.js:218
   evaluateJS resource://devtools/server/actors/webconsole.js:895
   evaluateJSAsync resource://devtools/server/actors/webconsole.js:788
   makeInfallible resource://devtools/shared/ThreadSafeDevToolsUtils.js:103

If I had known what I was doing in the first place, I might be able to adapt to this version of Thunderbird. Something obviously changed in how the Error Console operates or something.

Does anyone know anything about what command could generate a message URI so I could open it from another app using the command line?

-Chris, the Reluctant Hoosier

Good morning . . . I have recently switched from an old Windows 10 machine to a new macmini, and have switched my Office 365 account over to it. Simply stated, Outlook is not working, and I have no desire to continue with it. Will Thunderbird suit my needs? Will it allow me to import my old contacts and emails, both from my Windows machine and the new MacOutlook?

Inkommande mail kommer upp först då jag kört reparera-funktionen, men måste göra det varje gång. Bilagor kan inte öppnas av dem jag mailat till. Har provat skicka bilagorna i både text- och PDF-form.

I own two computers running MacOS 10.15.7 Catalina and have Thunderbird installed on both. Until rather recently, the Thunderbird version was 140.8.1. Then I noted that it was impossible to send e-mails, and soon discovered that the cause was outdated server settings. They could not handle office365, so I installed Thunderbird 148.01 and changed to settings that should be able to do so. This worked very well on one of the computers, the one which has a fast (SSD) hard drive, but not on the other that has a slow (non-SSD) drive. The error message that I get with the slow computer is, surprisingly, the same as I got with the older Thunderbird. But I suspect that the real cause is some kind of timed-out process.

If any of you could explain what happens and tell me what to do, I would be very happy. Maybe I should choose a Thunderbird version somehere between 140 and 148?

Helge Malmgren

Thunderbird does not recognize my CenturyLink login password. This started yesterday. I can access my CenturyLink web mail. Have deleted my TB account and set up a new TB account without success. Have confirmed the account settings, etc. Assistance would be appreciated.