Thunderbird Support Forum

I have Thunderbird set up with several different email accounts. In December 2021, one of the email accounts suddenly stopped working. It won't receive or send emails. I didn't change anything.

I'm not knowledgeable about figuring this stuff out, so I'd be very grateful for some help. The email that's not working is a gmail account. At first I was getting an error message about the password not working. I'm positive I'm using the correct password, because I tried it on https://mail.google.com/ and it worked fine.

I have Windows 10. I updated Thunderbird to 91.8.0 (32-bit) and it didn't make any difference -- I still can't receive or send email from the problem account. I didn't change any server settings (they are the same as my other gmail accounts, except for the specific account names).

When I try to get messages, it says says Connected to pop.gmail.com...

then

connection to pop.gmail.com server timed out

I have no idea what this means or what to do. If you need more information about my settings, just let me know what you need and I'll get it.

Thanks for any help you can offer. At this point I'm desperate.

I 've used Thunderbird for several years without any issues - thank you for that - but suddenly, over the last two or three weeks when sending a message, I have been getting an authentication error message from my ISP and the e-mail is rejected. This occurs every time I try to send an e-mail after rebooting my PC.

A password change made no difference.

Incoming messages are not affected.

Clearly my ISP is blocking the messages because it is not receiving the correct password or account name - but why?

The workaround I have discovered is to enter troubleshoot mode, then send the e-mail (successfully). Then I can exit troubleshoot mode and any later e-mails are also sent successfully - until I reboot the PC and then I have to repeat the procedure again.

I am using v91.7.0 (32 bit) on a 64 bit PC and running two e-mail addresses, both of which exhibit the same behaviour.

I do not have any add-ons and I use default preferences.

Any help would be appreciated.

I can not send emails using thunderbird . I have tried to reply to emails, as well as different emails to a variety of recipients I get the following message. Go to https AUP#IPBL1000. I have not gone there, Is this a scam? How do I get back on track?

Hi,

I have several email accounts in Thunderbird (91.8.1 (64-bit), but for some reason there are always issues with my mail.com [not gmail] account. Emails have been ending up in people's Spam folders, and often when I try to send an email I get the following error message in Thunderbird: ______________________________________________

Sending of the message failed. An error occurred while sending mail. The mail server responded: Requested action not taken: mailbox unavailable Failure sending mail. Try again later. Please check the message recipient "[email@address.example]" and try again ______________________________________________

This happens at random, with different recipients - when I send the same email from my account via the mail.com website, this does not happen, so it must be a Thunderbird issue? Please help!

I've been using Thunderbird for many years and have continued using it successfully since my office changed its e-mail service from serverdata.net to Office 365 several months ago. (Server outlook.office365.com, connection security SSL/TTS, authentication method Normal password.) All was working well as of late on Sat Apr 23. When I next called up T-bird (on my Win 10 laptop) late on Sun Apr 24, I could no longer login to my account. Verified correct e-mail address and password, but multiple attempts to login were all rejected. I could still get in to my account via Outlook at portal.office.com as well as Outlook on my Android, but I can't get in via T-bird....but I hate Outlook and really would prefer to get T-bird working again. On returning to the office the morning of Mon Apr 25, I tried as well with the T-bird installation on my Win 10 desktop (which, again, had long been working fine) and immediately encountered the same problem. So it seems that either there was a silent update to T-bird on Sun Apr 24 which broke T-bird's ability to connect to IMAP on office365.com, or Microsoft did something to the IMAP service on office365.com on Sun Apr 24 which broke T-bird's ability to connect to that service. Yes, I know I could get the Exquilla extension for T-bird and try connecting via the Exchange protocols, but before I do that, it sure would be nice to know whether it's T-bird or office365.com that broke. Anybody else having the same experience? Any solutions figured out yet (other than Exquilla)? Thanks for any insights!

-- Larry Afrin

My Thunderbird set-up has worked fine for years so I was surprised to discover two days ago I can no longer send emails. I have a Gmail SMTP account which I have never previously have a problem with.

Thunderbird updates automatically and I am on version 91.8.1 - it's possible the problem began when the new version was downloaded but I don't know when that was.

Whenever I try to send an email I get the error:

The message could not be sent because the connection to Outgoing server (SMTP) smtp.googlemail.com timed out.

All of a sudden I can not use the Bcc to send out mail. A dialog box appears no matter the selection of any address from address book to send to, including myself. See screen shot below.

Hello,

I encounter an error when sending a message with an on-premises exchange server. With Windows, an error window appears and is automatically closed. On Linux, the window remains displayed, which is problematic. In both cases, the message is sent and copied to the sent messages folder The windows error message says "copy to sent folder error" (obviously wrong) In console the error raised after QUIT command of mailnews.smtp with the error code 2152398868.

the error was reported by several of our users and I was able to reproduce it.

Console Log : mailnews.smtp: Message sent successfully. SmtpClient.jsm:1293:21 mailnews.smtp: C: QUIT SmtpClient.jsm:579:19 mailnews.smtp: error { target: TCPSocket, isTrusted: true, name: "NetworkError", message: "Network", errorCode: 2152398868, srcElement: TCPSocket, currentTarget: TCPSocket, eventPhase: 2, bubbles: false, cancelable: false, … } SmtpClient.jsm:434:17 mailnews.send: Sending failed; Le message n’a pas pu être envoyé car la connexion au serveur sortant (SMTP) « ******* » a expiré. Veuillez essayer à nouveau., exitCode=2153066800, originalMsgURI= MessageSend.jsm:336:27 mailnews.smtp: S: 221 2.0.0 Service closing transmission channel SmtpClient.jsm:413:17 mailnews.smtp: Closing connection... 3 SmtpClient.jsm:153:17 mailnews.smtp: Socket closed.

My Thunderbird app has not received or notify me of any emails for the past two days. I've had to use it on google in able to see my emails. It just has a continuous loading sign when i say get mail and nothing comes through. I have tried uninstalling the app and redownloading it too

This is to re-open thread 1322371. I recently (2 weeks ago) upgraded from Ubuntu 18.04 to 20.04. In the process I did a general update of all apps (part of the global update process) and ended up with TB 91.8.1 build 20220413002405. The problem reported in thread 1322371 has started for this build (previously never seen) with the same symptom and work around. However, although I haven't really been scrupulous observing and analysing, I get the sense that it is manifesting itself only on the inbox. I have a mail system of over 4G of mailboxes now and there are some mailboxes that have quite a large number of messages in. It looks like the problem only happens with the inbox. Also looking at the old thread (people reporting all messages disappearing) I find that the messages disappear after using the quick filter (1. insert a string into quick filter, hit enter; 2. Do something with the shorter list of messages (read, move, delete etc); 3. all messages disappear; 4. (work around) click on another mail box then back to inbox: all messages reappear. Nice one :) Over to you guys

Here's something I've never seen in more than 20 years of using Thunderbird. It's more of an aggravation than anything else, but I'm asking about it because I hope it's not a sign of something more serious:

I receive: "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.office365.com timed out. Try again."

But the message does send. This happens mostly with my Hotmail account, but also sometimes with either of my two Gmail accounts.

This started after an update to Thunderbird; one of the v. 91 updates, I think. None of my settings changed and I've done nothing different to the Thunderbird settings in years. I'm running Thunderbird on Xubuntu 20.04, 64 bit, and the current Thunderbird is 91.9.0.

Any thoughts? And thanks for your help.

Since Friday 5/13 I have not been able to send emails from Thunderbird. I have read just about every thread and did everything people have suggested but still having the same issue. When I try to send an email, it will give me the "sending of the message failed" message and when I move that down there is the "creating mail message" bar that is behind it. I've had our IT guy look at it and he cannot figure it out. Any help would be appreciated!

Thanks,

Thunderbird just "contracted" (read 'deleted') almost my entire inbox. I need those e-mails! Please tell me how to get them back! And how to keep this from happening again.

Thank you,

Erif.

Not sure if I've done something to cause this, or whats happened or if this is a bug in the beta release I'm using.. 101.0b2 (64-bit)

When I open an email from the inbox view to read it, it always goes into write/edit/reply/send mode(not sure what to call that mode). It's only just started to happen.

Is this a config/settings error I could have caused ? Other Suggestions?

++Mark. https://ctproduced.com

"Error Message-An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again." I have two addresses(Same Domain). Address A works fine when sending a message. I get this error message when sending a message using address B. No problem receiving mail with either address. What do they mean by "Mailbox unavailable"? . I checked the outgoing server of address B, It is not added automatically so i was added manually, But still it is getting an error. Your help would be appreciated.

After update to above Beta I keep getting mailbox filter errors on Default account, occurs at start-up & when some new messages arrive that are sent into the filters . See screenshot attached. Many Thanks