Thunderbird Community Forum

本件はIMAPでMicrosoft365アカウントをサインインしようとしたときに発生している事象です。 最初のユーザー追加画面で氏名とメールアドレスを入力します。 その後、メールアカウントの種類を選択する画面でIMAPを選択して「続ける」をクリックしても「設定を検証できませんでした。ユーザー名とパスワードが正しい場合は、サーバー管理者があなたの選択した設定を無効化している可能性があります。別のプロトコルを選択してみてください。」と表示され追加ができません。 上記メールアカウント選択画面で「設定を編集」をクリックしても結果は同様ですが、「詳細設定」→「テスト」をクリックすると、「次のアカウント設定が、指定されたサーバーを調べることにより見つかりました: 」と表示はされます。 しかし、続けようとすると「受信サーバーの設定がすでに存在しています。」と表示されてしまいます。 なお、Exchangeを選択した場合は追加できます。 Microsoft365アカウントについてはIMAPを有効化していますのでアクセスがブロックされているわけではないと考えています。 解決策を教えてください。

I just installed NORD VPN, and I can no longer send any emails in Thunderbird. Receiving is just fine. Gmail works fine. The addresses in Thunderbird are all Spectrum charter.net addresses. I have spent over 5 hours trying to get his working, seeking help from every possible source that I could think of. The spectrum addresses can send and receive just fine when logging into spectrum. This is probably a pretty common association, that is Nord VPN and Thunderbird. And with the big black Friday sales there should be plenty more people with the same situation. If you can give me any ideas about a solution, I would be most grateful. Thank you Bill Lowe

Won't connect to Host Server. The error notification window won't allow me to get back to the app to check settings. The only option given is "Try Again". I don't know why it all of a sudden won't connect, because my iPhone connects just fine

Thunderbird cannot setup Outlook mailbox after upgrade to Windows 11

clearing passwords from the credentials caches in TB and windows makes no difference. Changing the password for the Outlook mail account and verifying it makes no difference.

No problem with 14 Gmail account accounts

Outlook and Thunderbird are a buggy pair. They will waste hours of your time. Experts will tell you that you’re an idiot and it’s really simple. But they can’t describe how to simply start from scratch and add an Outlook account. They just assume it works naturally for everybody because it worked for them. Maybe it does work 60% of the time. Good luck plan to spend a frustrating evening and then think about something other than Microsoft and Mozilla.

I keep getting this message from google: "400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know.” (see screen grab attached)

I have 3 different email accounts on Thunderbird. All was working perfectly yesterday. Today, none of the email accounts can connect with their respective email servers. (Two are Verizon/AOL and one is gmail.) I have tried various fixes with no joy. At this point I give up. My email is very important in my life (I'm 81 years old) and Thunderbird is simply way too hard to fix with non-existent help. (Your Community help line is a joke unless you have technical knowledge. Nothing ever quite fits the problem so it is no help at all.)

I received this message: Unable to connect

The connection was refused when attempting to contact localhost.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Thunderbird is permitted to access the web.

I am not receiving new email. What do I need to do to get it working again?

I've tried this with both the Mac (Sonoma) version and the Windows (11) version. Thunderbird can't connect to the server. I've been setting up these accounts for years in Apple Mail, and I know the settings.

I was able to set up an account from a different email provider, however.

Hello! I have a question regarding Thunderbird version 144.0.1.

The server is configured locally and isolated from the Internet. There is an issue: when the network cable is unplugged (no network connection), saving received emails with attachments (for example, total file size of 14 MB) to the hard drive happens quickly — about 5 seconds. However, as soon as the PC is connected to the local network, the saving process for such attachments slows down significantly — up to 60 seconds.

I would appreciate your help with analyzing this issue and possible solutions. What could be the cause of this behavior?

Thank you!

I've been trying to set up Thunderbird to manage my emails. I've had no issues connecting to gmail accounts, but when connecting to mailfence, the connection times out. I've tried increasing the timeout limit, changing my network and firewall settings, and re configuring the server settings with no luck. Are these services not compatible? It seems like this shouldn't be this complicated. Any help is greatly appreciated!

This morning I was receiving e-mails in TB as normal. This afternoon my e-mails have stopped (sending/receiving) and I have seen a message " Connection to server pop.virginmedia.com was reset. "

I have tried turning the PC off and on - no effect. In FireFox I can connect to web pages as normal but my e-mail has stopped working. A couple of days ago I changed my Virgin router but only now has my e-mail stopped. I can receive e-mails on my Kindle but not on my Windows 11 PC.

How can I reconnect to the internet, please?

Thank you,

Tregarth

On January 13, 2025, Thunderbird was changed in a way that made it not function with Optus.

Please give me very precise instructions on how to make it work again.

I have donated to Thunderbird's development, but have not used it for 10 months because of this problem.

I cannot often download emails via a hotspot. Sometimes one or two will come, then it will just stop. I get two different error messages. Most of the time I start with the "Home folder is being processed," then it will refuse to write to the disk. I have no issues at home or on wifi, only with a hotspot connection.

Since we frequently camp where there is no internet, this is a bit of a bother. This is xfinity email over a tmobile hotspot. Thanks for any hints.

I suddenly this week cannot send email using Thunderbird (v. 140.4.0esr (64-bit)). I receive email fine. I can send email using webmail with my provider. Error message in Thunderbird is: "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-h2p-555359.sys.comcast.net resomta-h2p-555359.sys.comcast.net ESMTP server not available (62240/216.183.125.238)." My provider says the issue is not at their end because my server settings are correct. Outgoing SMTP port is 465, connection security SSL/TLS. Operating Windows 11 v. 24H2.

I can't get into my email. It is Mozilla Thunderbird. I had lost connection with the Internet. I called a man who works on computers. He said a cable was not attached. he re=attached it and left. Now I cannot access email. Virginia Taylor ginny.taylor1943@gmail.com

We are about to switch from one internet provider to TMobile. Will I have to do anything in order to maintain my email through Thunderbird? I am clueless. After many months, I just got Thunderbird working again and don't want to lose it!