Thunderbird Support Forum

Thunderbird suddenly says "authentication failed" for my rocketmail email. Was working fine up til now. I can still log into the email directly via Yahoo. Any ideas on how to fix this.

Can't send Yahoo Mail. Was working fine until this afternoon. Getting error: Login to server smpt.mail.yahoo.com with username xxxx@yahoo.com failed. Using Thunderbird 115.11.1 (32-bit). Can someone help? Thanks!

I have 2 windows 10 computers both with Thunderbird. One computer never has trouble with getting emails. The other shows every day "Login to server mail.hoster905.com with username cnc@lcgnm.com failed" I have reset this one password at the server, entered the new password in Thunderbird and can the get mail. That day only. Next day same problem.

I have been using Thunderbird for many years. In Thunderbird I found this message: "Login to server inbound att.net (username) failed." When I tried to send an email I got this message: "Sending of the message failed: Unable to authenticate the Outgoing Server (SMTP) outbound att.net. Please check the password and verify the "Authentication method" in "Account Settings." [outgoing server (SMTP)]

I went to att.net and I am still receiving emails. In fact, I received an email from Mozilla Support that allowed me to sign into Mozilla Support.

Please help so I can send outgoing emails from Thunderbird.

Thank you

I can't paste the link I get from Dropbox to connect FileLink for Dropbox into my settings. Why not? Even when I type the very long string by hand, it will not connect. What am I doing wrong? Is there a step I am missing? I really need this feature. Thanks- Pat Stoll

A while ago my long-time hotmail account stopped working on two computer with windows 10 and one with windows 11. Last night, I looked up an article that said I have to use Oauth2 instead of normal pw. I made that change on the windows 11 machine and a popup occurred that wanted the number from the google authenticator on my phone. I gave it that and it checks mail now just fine.

This morning I went to one of the Windows 10 machines and did exactly the same. I tried some different server names online and tried some, but after a while I started getting a little window that asked my email address and pw. I put my hotmail address in and got this message:

Microsoft Accounts or personal email addresses don’t work here. Make sure you enter your work or school account (e.g. user@contoso.com). If you want to reset a Microsoft Account password, click here.

Now this is the very same hotmail email that worked on windows 11 with the same server settings last night. It still works.

Now, on the windows 10 machine with those same settings, I get the blank extra window. The extra window appears, does not populate, and disappeared.

It is: https://login.microsoftonline.com/common/oauth2/v2.0/authorize?response_type=code&client_id=9e5f94bc-e8a4-4e73-b8be-63364c29d753&redirect_uri=https%3A%2F%2Flocalhost&scope=https%3A%2F%2Foutlook.office365.com%2FIMAP.AccessAsUser.All+https%3A%2F%2Foutlook.office365.com%2FPOP.AccessAsUser.All+https%3A%2F%2Foutlook.office365.com%2FSMTP.Send+offline_access&login_hint=redacted@hotmail.com

I had no opportunity to do what worked on the windows 11 machine just last night. I cannot check mail on hotmail on this windows 10 pc. I took all the updates available to Thunderbird and firefox. TB is 115.11.1

I'm stopped. Why would it work on one pc and not another? Oauth2 on the windows 11 asked for authenticator. On the windows 10 it never asks.

Thunderbird downloads emails properly when first opened but the comes up with error as per attached for subsequent downloads. It does this for all (5) email addresses I have. Every once in a while when the error message comes up, Thunderbird freezes completely and I have to force quit. (on Mac)

Install of Thunderbird accepted my donation but does not complete the install. It just returned to the donate screen again. If I try to return to the install exe it wont pass the donation screen. I like Thunderbird but not enough to pay twice. How do I get the install to complete? Appreciate any ideas. Thanks

Since Thunderbird updated to 115.11.1 (64-bit), , the DEL key no longer deletes messages from within the message window. It DOES still delete the messages from within the message list. Any ideas as to why?

My calendar stopped syncing one way: when I add an event in Thunderbird, it does not appear in Google calendar. It worked fine until about a month ago. I am using version 115.11.1

Thunderbird has suddenly stopped pulling in email, please help. It just says 'Checking mail server capabilities'. I have changed no settings at all. Webmail works. Email on my phone works. So it's not the ISP or the server or anything like that. It's just on Thunderbird where I can't do anything, but I've not changed anything so I don't understand.

When I try to send email it fails and says: Sending of the message failed. Unable to communicate securely with peer: requested domain name does not match the server’s certificate. The configuration related to mail.mandyhaggith.net must be corrected.

So please can you tell me how to correct the configuration?

Thank you for any help you can offer.

Best wishes Mandy

v115.10.1 I made a mistake setting SMTP credentials, wrong protocol, and it just stays on Sending dialog. So I abort when I realize I made a mistake and come back to mail I was to send. - but 30-60s after I aborted comes an error message saying it timed out

So the cancel button does not really cancel the send attempt, it seems.

Not sure where to report bugs, so do it here. Thanks.

I'm using Thunderbird Supernova, Can anybody tell me why I have (a DRAFT and DRAFTS) folders? When I save my emails for later they are saved in the DRAFTS folder, the DRAFT folder appears not to be used. I have tried to delete it but guess it must be some sort of system folder. Any help please. Thanks