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I keep getting authentication failure while connecting to server for different accounts every time I start thunderbird. It's usually just one and sometimes 2 accounts that fail. When I click on the individual accounts they start working just fine. I get this for yahoo, gmail, outlook and a couple of others. Something to do with the initial start of thunderbird I think.

On early version of Thunderbird on Windows 7 I see the mesage window below the header window. I would like to see the same on the later version on Windows 10 and 11. So far I've been unable to find a control to do that.

Aloha. I'm helping a friend with setting up a new Windows 11 PC, and cannot get Thunderbird to connect to Spectrum's servers. I spent an hour on the phone with Spectrum support and they just gave up and said it must be an issue with Thunderbird. Here are the details:

- Brand new Dell 24 All-in-One EC24250 - Windows 11 25H2 plus all additional fixes. - All Dell drivers updated. - Thunderbird V155.0 64-bit

If I click on 'Get Messages' after a while I get: "Connection to server mail.twc.com timed out". I've gone into the config editor and changed mailnews.tcptimeout from 100 to 500 and still get the error.

In the Account Settings | Server Settings | Test server connection I get: An error occurred connecting to mail.twc.com:993.

I've tried this with both setting up a brand new account in Thunderbird, and also via copying the 'Thunderbird' folder from %appdata%\roaming from her old machine.

Email configuration (from Spectrum).

IMAP Settings Server name: mail.twc.com Port: 993 user name: abcd@hawaii.rr.com Connection Security: SSL/TLS Authentication method: Normal password

SMTP settings Server Name: mail.twc.com Port 587 Connection Security: STARTTLS Authentication method: Normal password

Can anyone help me troubleshoot this scenario?

Mahalo, Harry Z

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.

I'm using Thunderbird 115.18.0 and just today it's behaving bizarrely. Crashed twice for no reason, and emails are taking "forever" to delete -- normally they delete immediately (unless they have an enormous attachment), but today I have to wait about 4 seconds for one short text only email to delete. Compacted folders, and made no difference.

Any ideas? Anything I can do to return to my normal I love Thunderbird condition?

Thanks.

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

Maybe I accidentally made a setting, but if I go get email, it sends it to trash and from there marks it as spam and sends it to spam at my email provider. This just started when I tried it this afternoon. I think it was OK in the AM. I use Linux Ubuntu. It moves all emails to trash and then sends them. I just looked at my message filters and they look normal to me, I do have something called SpamAssasinYes, which I remember from years ago that looks at the whole complete header and sends an email to all the providers in it telling them that their user is using their server for spam. Maybe that has changed somehow, but I forgot it was there because it has been there for about 20 years. Should i just remove all those filters and see what happens? I need some guidance. thanks

When are you finally fixing the exponentially raising problems to work with Thunderbird and Gmail? It is getting totally out of hand! Since my upgrade to the latest version NOTHING works anymore!

After stating TB the imap.gmail.com is running forever, freezing TB up. After ending the hung up programs 5 TB processes remain. Even after trying to kill them in the taskmgr, one remains active forever, is NOT kill-able anymore, and PC needs to be rebootet. End of story!

TB become a HORRIBLE Disaster!

I have "Allow remote content in messages" turned off. However I receive many messages for which I wish to allow it for that message. I do so and it works fine.

What I would like to be able to do is to have TB learn the message senders for whom I have allowed remote content so I don't have to click it every time. Is this a feature that is available that I am missing, or is it just not possible?

If not possible, please advise as I will submit for an enhancement.

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?

I was adding some filters for senders to move emails to my local folders and such, and then I ran the filters. For whatever reason, when I ran the filters this time, thunderbird also seemingly deleted all emails from some of my web email inboxes. The only one that wasn't affected by this inbox wipe was my school email(gmail provider). How can I prevent this from happening again?

This just started today. I am seeing question marks between the sentences in my messages. I had this issue a number of years ago and do not remember the fix. I am running the latest version on my Windows 7 desktop. It is just the new messages not the older ones in file.

Anyone remember the fix?

Thanks

Al

Our e-mail became slow, and wont open new e-mails. This has been for at least a week. A few days ago our e-mail account stopped working cokmpletely, and when prompted to sign in, it does not recognize our password. I am contacting you via a different e-mail as we have no access to hrttohrt@charter.net, which has been our primary e-mail account in thunderbird for years. What can we do?

Multiple Thunderbird Problems that started around 9/1. (Now 9/8/26) TB won’t properly download emails

   • Status bar will say “downloading 1 of 61”, pulse a while, nothing happens, then says “nothing to download”.
   • Yesterday there were no downloads 5 pm to midnight. Left on overnight in the AM there were 114 emails in box, 20 of them dated previous day 2:33 pm to 5:43 pm
   • Morning Inbox also contains 9 emails dated 8/31, which are duplicates of emails received on that date and placed in trash then.
   • It is a big business problem that I cannot rely on receiving emails in timely manner.

Many times cannot simply SEND email in TB

   • I will compose email, click send, and recently cannot expect send to be successful. Often get the message "Sending failed because connecting to Outgoing server (SMTP) failed"
   • Sometimes 5 minutes later I click SEND and the message is sent. Other times it will not send at all for hours and I am forced to use my gmail account to send an important email.

Have performed the fixes suggested online without relief

   • I have checked that the SMTP is correct. (Also sometimes SEND works)
   • Have deleted the file global-messages-db.sqlite 
   • Saved my profile, deleted the TB program, reinstalled TB, copied in my old profile.

I am in the midst of the long process of moving most (not all!) of my gmail from the gmail server to TBird, using filters as discussed in this thread.

I've started by first using filters on less important emails (ie so that no true disaster occurs if something goes horribly wrong). As I do so, I have questions!

For example, let's say I use a filter to: copy all the emails from @someone.org to a local folder then delete those emails (from the server)

What happens if one of those emails happens to be within a thread, including emails from people who don't match the filter (ie are not @someone.org). Have I broken the thread forever, ie, has something gone horribly wrong? If so, how do I prevent this behavior/have the entire thread move along with the targeted value? If not, I don't see how I can move email without breaking threads, which is a bit of a problem.

(Also - whoops, I see I should update, but the question remains.)