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When replying to an email or sending a new mail I get the message :- An error occurred while sending mail. Server responded : You need to authenticate when sending mail from (ip address) Please check "message Recipient" and try again. How do I authenticate ? Thanks140.7.1

For the last two or three weeks I have had problems with Thunderbird not downloading e mail from Charter for a few days and then it does for another few days, then it doesn't. Back and forth until the last two days it just seems dead, doesn't receive or send anything. What do I do?

thunderbird Version 153.2.0esr (64 bits) Hello, following an update, email retrieval is no longer working for an account with a ....@rocketmail.com address. Thunderbird opens a "Yahoo" login window, but when I enter my address, it is flagged as invalid. Fortunately, I am still able to log in to this account via a web browser. (Google translation from French to English)

I can no longer get email from my Yahoo email account. I've gone through all the troubleshooting hints and recommendations, as I understand them, but without any luck.

I only have the one account.

The Activity Manager (see attached) shows "No messages to download", but the message at the bottom left said there were messages, but TB doesn't download them.

I think I posted my question in the wrong place yesterday, because I've had no responses. I will delete that Post.

Since yesterday I have been unable to send emails from any of my email accounts. Most are Microsoft accounts.

The first message attached 'pops up' every time I open / reopen Thunderbird Mail.

I saw something that looked unfamiliar to me under Programs and Features and have attached a screenshot of that, along with a screenshot showing the version of Thunderbird on my desktop PC.

Could updating to the latest version of Thunderbird have caused the problem?

Repeated attempts by Thunderbird to sync have alerted Google security about a gmail account I've been using. gmail requires me to sign in, but after entering my password, won't accept the UK phone number I am required to enter to verify my account. Clicking on 'Try another way' doesn't give me another way, so I'm in danger of losing access to that account.

Is there a quick and easy means by which I can permanently save all my sent and received gmail emails that are presently in Thunderbird?

These will be lost if I have to delete Thunderbird or when my PC fails. I can back up files on my PC but not Thunderbird emails so far as I'm aware.

Inbound emails are going to Trash instead of Inbox.

No changes have been made. How can I check settings to find a solution? I see nothing related to this issue. Thanks for any help.

Thunderbird is downloading new messages but failing to display them.

Other functionality remains active, ie I can see and open messages, delete all the contents of folders, compose and send messages, but when the software downloads new messages they simply do not display and cannot be accessed.

Not sure if it's relevant, but the message INBOX count appears to be stuck at the number 59, although more messages than that have been downloaded.

Bizarrely this is the message displayed whenever I now open the Thunderbird application (it was there when the problem first appeared and returns everytime). Out of desperation I even made a donation in the hope it would release the messages!

Thank you in advance, Steve Davidson

When I open Thunderbird it is sending my emails directly to the deleted folder. I have tried all-sorts and cannot find an answer. I transferred Thunderbird to my new PC and all was working okay for a few weeks then all of a sudden there were emails missing from my inboxes and I found them in the deleted folder. I am 76 years old and need an easy step by step solution please ..... John

Is this a known fluke. In group with more than one email I see the excerpts and can easily deal with them (delete) but if there is only one in a group I can do nothing?

I don't know if this is the correct topic to select but there is nothing more relevant.I am using windows 11 and When I try to delete e mails (G mail) I click on the e mail and then delete. The e mail then disappears and I then quit out of e mails. However the next time i go into my e mails it is back again. The only way i can get them to delete is to again tick the e mail i want to delete and then click delete. If I then go into something else e.g. drafts or spam and then quit out of the e mails when i go back in the e mail i wanted to delete has gone. I have tried resetting firefox but makes no difference

I have several Yahoo accounts set up in Thunderbird, but I get this frequent (several times a day) error notification from just one:

"The current operation on 'Inbox' did not succeed. The mail server for account Yahoo (xxxxxxx) responded: p."

I'm sure this is a truncation of the complete error message. How can I see the complete message?

There seems to be no consequence of the "error" - everything appears to work as normal. It's just annoying.

My email was working then suddenly stopped. I have been connected to AT&T (Currently and Yahoo). I finally got it touch with AT&T mail. They claim that they no longer support or connect with Thunderbird.

Does anyone know if this is this correct?

Thank you for any help!

Or does anyone have any suggestions on what may have happened. This started one or two days ago from 09/09/2026

Hi Support,

For the past few days I have been using Thunderbird as my mail app for office 365 account and it has been working however today I have attempted to send an email and it has stopped being able to. I get prompted to re-enter the password go through the login and the 2FA and then get to the "You're all set" response page and when I go back to the thunderbird app I get prompted to re-auth again.

Are there any troubleshooting steps I can follow to find out at what stage it is failing?

I have it configured for smtp-mail.outlook.com with port 587, StartTLS and OAuth2 selected. A username is also configured.

I have set up 4 email accounts in Thunderbird. I tried today to set up another email account with the same domain. selected the New Account Button (email only); then pop up screen to add name of account user and users email address. next menu, TB was successful finding the server but a small yellow flag says "unknown hostname" but lists the 3rd party host, that there is SSL/TSL security and the user name matches the new account information just entered. Incoming settings looked correct. The next screen is Choose email account type and it was auto populated by TB and all info is correct. Next, enter password (for new account?) and TB fails to create a new account. Says Authentication error unable to log in at server. Tried doing the manual config. Outgoing server protocol shows SMPT when it should be IMAP (correct?) but the field is un-selectable. So results are same, Unable to log in to server.

the manual config screen has a host name field and it is autofilled with my company's name.domain but it is misspelled! Tried to edit but no success. I really need to get this new account up quick! So asking for any help available.

Reinstall of Thunderbird after a few years easy with all my old (sub) folders captured from service provider. However, neither delete folder (via any option) nor create folder is acted upon. Also ignored is attempt to rename a folder. Inbox contains over 23 000 messages but none after 5 December 2025. Deleting hundreds permanently on provider has no effect on Thunderbird. Some folders are empty but but are labelled as containing hundreds of messages.

Trying to send a message results in error, 'Could not detect login form.' But I am logged in.

Any pointers to unclogging system gratefully received. Chris Oldman

I have my gmail emails rerouted to my outlook email address and in past week my emails are not showing up in Thunderbird for a number of days after they are visable in my outlook program. Why? I have compared my Thunderbird settings with my partner and they are the same. Only difference is that my partner picks up her gmail email directly, does not use outlook and does not reroute her emails. She does not have any problems with emails arriving late to her Thunderbird inbox. We are both using same version. Any suggestions?