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Hello, For the past few days, I've been receiving three messages. My email provider (free.fr) tells me the problem isn't on their end and suggests I contact Thunderbird. Can you help me resolve this?

Thank you

I can't seem to get Thunderbird configured correctly to get the "send to" function to work. As in sending a file from the desktop. I checked the default file association, and it looks to be set correctly. Help! And thanks.

I have a Signature setup and it works great on NEW Emails, however, if I click on reply to an email the signature is not there. I have the checkbox checked for "Include signature for replies" but it doesn't seem to work. I've tried unchecking it, restarting the app, re-checking it and restarting again, still doesn't work.

Windows 11 Pro, Version 10.0.26200 Build 26200

Every time I open up Thunderbird email I get a message box which pops up saying " Sending of the Message failed An error occurred when sending mail. Were sorry but we cant send your email. etc, etc and "Please check by sending it again(6-1-1-2)

ID (68CA1CA0089AF165) please check the message and try again"

How do I find this message ? When I look at sent items in my mail , I have sent nothing and I am not aware of sending anything.

I have been trying to delete a large number of unwanted emails in my All Mail folder. However, once I delete them they are restored. How can I clean up this folder permanently?

Hello, I can receive email messages but unable to send them out. The error message I get follows:

The mail server responded,( bettyweber@shaw.ca sender) rejected AUP#POL. Verify your email address is correct in account settings.

What can I do to fix this in Thunderbird?

I checked with my service provider and I can receive and send messages through webmail but not Thunderbird.

Thanks. Betty

Hi, I am using Thunderbird on my Android phone and PC. When I send emails from my Android phone, the emails are sent but a copy is not stored in the "SENT" folder of my phone. This feature used to work in the past, but now it doesn't anymore.

How can I resolve this? Thank you.

Hello, I'm using the most recent version of Thunderbird on a desktop using Windows 11. Just this morning (Aug 11), all incoming email to all my four accounts are coming in with no subject or correspondents showing and when opened the email is not formatted in HTML, just plain text and lots of code. I have tried several fixes with no success: repair folders, turn off all add-ons and anti-virus protection, uninstalled and reinstalled software. Can you help, please? Thanks!

I have had Thunderbird on my HP laptop for several years. Everything has worked perfectly. BUT, I cannot receive Email, starting yesterday. When I click the Get Email icon, nothing happens. My Email server on Comcast is getting Email which I can see and read, but Thunderbird is not getting the Email. I would appreciate any advice.

Regards, Jim

Hi,

On Thunderbird 140.4.0esr (64-bit) and on 144.0.1 (64-bit) both WIN11 I have this problem since yesterday:

New message Signature is shown

I add the To: To: xyz@com.com

Signature disappears, mail is sent and received without signature

The signature which I use "since many years" is HTML

As you know there has been an update on WIN11 yesterday...

Any hints?

Thanks for your time

Bob

I've been using Thunderbird to access my Comcast email for two years now, without problems. Except yesterday & today, when I've been unable to send or receive emails, for no apparent reason. Yet, when I connect to my Comcast/Xfinity email via the Comcast browser website, sending and receiving of email works fine. This access problem began yesterday, 10/14/2025.

Same email address I've been using for about 20 years now, and same password. I made no changes to my Thunderbird or Comcast settings. Sending a test email to myself via the Comcast email website works fine. Clicking on the "Get Messages" icon in Thunderbird results in no action whatsoever. Sending a test message to myself in Thunderbird results in about a 40 second delay (usually it's 10 seconds), and then the error message "Login to server smtp.comcast.net with username don-peters@comcast.net failed." It then asks if I want to try again, but if I agree, the same error results. But there is also the option of "Enter new password". Click on that and the same error results, without even asking for a new password. But my password is OK, as evidenced by my Thunderbird settings and being able to log into Comcast browser email.

Yes, I've spent hours on the phone with Comcast on this issue, but they were of no help. One agent claimed that the issue was with Thunderbird, not Comcast, as its webmail worked fine. Two years ago, I had a similar problem I spent hours trying to solve. It turned out the problem then was due to Microsoft Outlook on my PC regularly trying to log into Comcast to ALSO download my email - BUT using the wrong password. Comcast interpreted these multiple failed login attempts as scammer attempts, and blocked ALL email logins from my PC. I fixed the problem by shutting down Outlook. But when I just spoke to Comcast they said the current problem was NOT due to my account getting blocked by them. But they couldn't give a reason for the blockage.

So, I now believe the problem lies with BOTH Thunderbird and Comcast. First of all, Comcast is somehow blocking my Thunderbird access attempts. But Thunderbird is also at fault for not reporting a SPECIFIC email login problem, so that we can address it - and fix it. If Thunderbird can be more specific as to why login attempts are failing, I can get back to them with the evidence - and hopefully solve the problem.

I've been using Thunderbird for about 30 years now, and I hate to give it up. But if this continues, I'll be forced to abandon Thunderbird.

All, recently set up email accounts and all was well. Used TB years ago & liked it for its ease. Now my signature is not working (set up with 'attach signature from a file instead' option FYI). Tried everything I can think of, disable add ons in troubleshoot mode etc. deleing & re-adding it. No new add ons have been added before this happened, they were added prior to setting up signature. And worked fine initially. Thoughts and please keep it simple for someone very old lol - pic attached for help perhaps?

TIA and appreciated

Login to the server pop.gmx.net with username "..." failed.

I have several accounts with GMX. Two work, and the other two display the above error message. Everything works when I log in via a browser, but not in Thunderbird. The account settings are identical for all four accounts except for the password and username.

What can I do?

Thank you in advance.

I used to be able to access filters and set them up, but now I can't even find where they're located to set a new one. I've been through every possible setting, and still can't find the filters. Where are they? They've obviously been moved to somewhere obscure since I last used them (many versions ago, and they still run, I just can't locate them).

Thanks in advance.

I've used TB successfully for many years to access several Yahoo and Googlemail accounts. Windows 10. Recently the Yahoo accounts don't work so I've tried several times deleting and reloading them. This may be a red herring but the trouble seemd to start when I installed TB on a new Windows 11 laptop and failed to load the Yahoo accounts. I've tried following both Mozilla and Yahoo help articles but ultimately success is partial at best (i.e. incoming works, outgoing fails) This is the sequence I have followed

251128 tried this: Deleted all yahoo accounts in Thunderbird

Edited outgoing yahoo server to

 smtp.mail.yahoo.com
 Port 465
 SSL/TLS
 Authentication method OAuth2
 User name johngherrett@yahoo.com

Added yahoo account johngherrett@yahoo.com name and email address

opens yahoo! login sequence enter email and yahoo account password - FAILS

logged out of Yahoo mail open elsewhere

Accept 'Configuration found in Mozilla ISPDB'

opens yahoo! login sequence enter email and yahoo account password - FAILS

Account Hub window 'Choose your email type' pick 'Edit configuration'

Changed Incoming server settings to: POP3 pop.mail.yahoo.com Port 993 SSL/TLS Auth method OAuth2 username = email address

Test

'Outgoing server settings' 'The following settings were found by probing the given server' SMTP smtp.mail.yahoo.com Port 465 SSL/TLS OAuth2

Continue

Authentication error 'Unable to log in at server. Probably wrong configuration, username or password.'

followed guidance from Mozilla article: https://support.mozilla.org/en-US/kb/thunderbird-and-yahoo Exit Thunderbird Wait a few moments for background process to complete Start Thunderbird

counted to 10+

restarted Thunderbird Yahoo account is not there Googlemail account is there - OK

'Set up another account' - email started again Name & email

opens yahoo! login sequence enter email and yahoo account password - FAILS: 'Something went wrong' - not helpful 'Go to help' in Yahoo dialog opens another page in kanji(?) close this

back in TB Account Hub window 'Choose your email type' pick 'Edit configuration'

Changed Incoming server settings to: POP3 pop.mail.yahoo.com Port 993 SSL/TLS Auth method Normal password [changed] username = email address

Test

'Outgoing server settings' 'The following settings were found by probing the given server' SMTP smtp.mail.yahoo.com Port 465 SSL/TLS Auth method Normal password [changed]

Continue

'Creating account'

'Authentication error' as before

Go to https://help.yahoo.com/kb/sln27791.html Login to yahoo account 'Ways to securely access Yahoo Mail'

Use an app password ************

Signed out of a 'current sessions' even if not recognised. (Except 'current device' which is the login just past.

External connections-> Create app password App name : Thunderbird Generate

Copied to clipboard ********************

Returned to TB

entered password 'Continue' Spinning icon and re-opens yahoo login dialog entered normal password 'Something went wrong'

entered app password 'Something went wrong'

Despite this, after closing the yahoo dialog, TB says 'Account created successfully'!!!!

Inbox appears

Note:server settings now set somehow to IMAP / normal password

Testing outgoing: Message fails, Yahoo dialog login fails Edit outgoing server which remains OAuth2 Changed to normal password

Tried app password - failed Tried normal Yahoo password - failed

I have two accounts with Thunderbird (*@talktalk.net and *@tiscali.co.uk). Each account will receive incoming emails (with or without attachments - single addressee or part of a group email). Periodically outgoing emails are blocked, with the error message 'Sending of the message failed. An error occurred while sending mail. The mail server responded: Reject for policy reason. Please check the message and try again.' Usually the issue seems to fix itself - this tome it has lasted longer than usual. Please can someone suggest a remedy? Tony

I must be doing something wrong. I am new to thunderbird, migrated from Eudora since I can't send mail with Eudora anymore.

I tried to configure Thunderbird as much as possible like Eudora, but ... it doesn't receive nor send mail. On the surface it looks fine, it seems thunderbird logs into the server, it seems it sends mail and checks for new mail, only I don't receive anything, nor send anything even though it looks it does. So what am I doing (or is going) wrong? (I can still receive mail with Eudora and today I checked and received 54 mails, none with Thunderbird)