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.

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.?

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

After first pressing "Mark" (K), the shortcut keys for "Mark as Junk" (S) and "Star" (S) are the same. Previously, the shortcut key for "Mark as Junk" was (J). Please make the necessary corrections.

最初に「マークを付ける」（K)を押してから、「迷惑マークを付ける」（S）と「スターを付ける」（S)のショートカットキーが同じです。 以前は迷惑マークのショートカットキーは（J)でした。

修正願います。

Установив цветовую метку и после обновить, то данные пометки сбрасываются и сообщения снова становятся белыми Проблема возникла примерно после 12 часов по МСК и продолжается до сих пор

Можно воспользоваться кнопкой "Получить сообщения", после ее нажатия также слетает цветовая метка (скрин)

Hi, I've been using Thunderbird for years. It's been a great utility. However, today when I started it up, there was a random folder (UserFolder_27) created in the system folders. There was no right click option to delete it. Here are the remedial steps I took to remove it.

• Exited Thunderbird, removed the Userfolder_27.msf file from directory, restarted. No change.
• Right clicked the main account and Unsubscribed from UserFolder_27. Exited Thunderbird, removed the Userfolder_27.msf file from directory, restarted. No change.
• In Account Settings>Copies&Folders>Message Archive the UserFolder_27 was checked (no idea why). Unchecked the main "Keep message archives in" box. Exited Thunderbird, removed the Userfolder_27.msf file from directory, restarted. No change.
• Rechecked "Keep message archives in" and selected another personal folder. Exited Thunderbird, removed the Userfolder_27.msf file from directory, restarted. No change.

Somewhere in the troubleshooting steps, it created a second Spam folder.

Any ideas on how to fix this?

I never had this problem before. People who get my messages, including the copies automatically sent back to me, have ?? ?? instead of the tabs or  ?? spaces I used in the messages. Messages sent to me from other people come in without the ?? marks. Example of my test message copied back to me: ?? ?? ?? ?? ?? ?? 26 Aug 26

To All: Disregard any "?? " in this message; I'm having some trouble with my email program.

This afternoon is our Board meeting at 5:00 pm on Zoom.

?? ?? ?? ?? ?? ?? Mary F Platter-Rieger

How can I fix this problem?

With thunderbird this has just started.

I frequently send email that I have pasted part of an article from a news website. The pasted text is the standard black text. The bit pasted, when I look at my sent emails, has blue text.

All my comments on the bit pasted in my sent email are in the standard black text.

Mail.com (and all its vanity domains like usa.com, europe.com, myself.com, etc.) & many such domains no longer work in Thunderbird. They used to

recoverable? reportable? If too much trouble, say so and I can let it go. previously they were populated with titles and email content no relief after compressing folders, nor using safe mode. rlse: 153.1.0esr on Win10 home 22H2 19045.7663

Additional details:

• Operating system: Windows (please specify your Windows version if known)
• The issue started on August 25, 2026.
• Thunderbird becomes unresponsive shortly after startup.
• A “System Integration” prompt appears before Thunderbird becomes unresponsive.
• I cannot click any buttons once Thunderbird becomes unresponsive.
• I tested both available profiles (“default” and “default-esr”) using the Profile Manager, but the same issue occurred with both profiles.
• I also started Thunderbird in Troubleshoot Mode with all add-ons disabled, but the issue still occurred.
• I can force-close Thunderbird through Windows when it becomes unresponsive.
• I have not deleted or modified any Thunderbird profile files because I want to avoid losing existing email data.
• The profile containing my email data appears to be “default-esr”.

I would appreciate any guidance on how to identify the cause of this issue and restore Thunderbird without losing my existing emails.

Today all my yahoo & aol accounts were locked (About 10) . I had to release all 10 of them before Thunderbird can receive emails on accounts that are not locked (other than hotmail , gmail etc). I am reasonably sure this is not a yahoo / aol issue (though I know they are owned by same company Verizon Media )

Because I have seen this problem in the past with other email domains . If hotmail or gmail is locked then I cannot receive any yahoo emails until I release all locks on hotmail or gmail etc accounts

I read somewhere it may be auth issue such as OAuth2 but all my my settings are correct to OAuth2

With the new meadow update when either replying to a message or selecting new message there is no command menu bar to send save as draft etc.... tried several of the commands an setting changes but nothing seems to work - can do cntrl+enter to send and that s about it....

all INBOX emails disappeared from one of my email accounts. The other is working fine. Emails that were still open in one of the tabs are also now just an empty tab. --no luck repairing folder or deleting INBOX.msf. If I go to the Charter/Spectrum website the emails are still showing What should I try next?

When I attempt to write/ reply/ reply all/ forward, the toolbar at top shows only the slanted pen symbol and "Write -- nothing below. So no "Send" button. The full toolbar that I am trying to recover is attached which I copied from a second computer. When I write click that "Write" bar at the top, noting in the drop down menu had any effect. Help/About says I am "up to date" running 153.1.0esr (64 bit)

Ok small issue but annoying, I'm using a desktop install of thunderbird,and upto the last few days it has worked fine,I was using a custom sound file to inform of new emails and that was working fine,but yesterday I noticed that no sound was being played when a new email arrived,I've changed it back to default and that is not working either.

Anyone any ideas why it's not working or how to get it back to a working basis?

A couple of days ago we could no longer send or receive email through Thunderbird. When we try, we get the notification "Connection to server mobile.charter.net to [email address] failed" and repeatedly get the notification that our server connection has timed out. We can send/receive through Charter's webmail site, but not through our Thunderbird email client. Thank you for your help.

I'm looking for a possibility to customize the font size of OUTGOING mails (not the incoming, these I could already change). For example, what term should I search for in the advanced settings?