Komunitné fórum Thunderbird

When I attempt to send email I get the following message: Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Policy-SC01 You’ve reached your sending limit. Don’t worry, you can send again soon..

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

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.

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?

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'm new to the community and don't really know how things work, so maybe this is the wrong place for this. I had a seemingly catastrophic problem after updating yesterday. All of the emails sitting in my inbox disappeared, and were gone from the yahoo server as well. Long story short, I figured out what happened. In my filter rules I sometimes had a blank entry at the end of the list. Previously that had been ignored, but after the update it is now treated as a match. So the first filter that had a blank in it caused everything in my inbox to be moved to a certain folder in my Local Folders. Obviously, it would be legitimate to not allow blank entries in the filters, but once you've allowed it, you really shouldn't make a change. In the end the solution was simple, but it wasted a fair portion of my day figuring it out.

On 3 August, Thunderbird was automatically updated on my Mac Mini to Version 155.0. Ever since, all incoming mail is placed in a folder called Satellite Radio, and distribution to the proper mailboxes stops.

When I returned from a 20-day vacation, I had a message that “Thunderbird had a problem and crashed. We’ll try to restore your tabs and windows when it restarts….” I do not know when the “crash” happened. However, I have had problems with my 5 AOL email accounts and sometimes the 3 GMAIL accounts since August 20. The AOL accounts are the worst problems. Emails from one account are coming through under a different email account. This is happening with two accounts. Emails for one of the accounts is not coming through at all. I can read messages; but I cannot send any messages through any AOL account. Sending messages through the GMAIL accounts is sporadic in going through. Although my husband and I have separately checked all TB menu items, tools, & settings, we have not found the answer to correct my problems. Any help is appreciated.

I like to know what is the problem at my e-mail setting? Since two weeks ago, when I sent a message, receiver could get my message, but there were no sent record in my Sent Message box.

Thunderbird stopped receiving new messages on 02/09/26. I've tried all the help solutions several times and still nothing. I am at a loss. I can send emails, but have to go to virginmedia to see new messages.

hi, in the last few days i have been having issues receiving emails from btinternet.com but only to my inbox (other folders are updating) i am getting the error message The current operation on 'Inbox' did not succeed. The mail server for account username@btinternet.com responded: EXPUNGE failed. i have removed the account and re-set it up, i have made sure expunge on exit is disabled, repair does nothing on the inbox, nor does compact etc. i have run out of ideas hy this is happening, so i downloaded bluemail, to see if the problem came from thunderbird itself. it is working fine on there and immediately updated all my mails. with no issues. i have tried deleting the folder 'username'@btinternet.com and the msf files. i need help to figure out why this is happening. i checked the IMAP settings and its all correct and the same as in bluemail. also worth noting i can SEND emails no problem too from that account, just not receive them... i have tried to add as many relevent screenshots as i can think of.

I have a problem to add my mail account on Soverin.com to Thunderbird under Linux Mint. If I have created the additional e-mail in Thunderbird and I put there a right passord it is not possible to connect Soverin server.

I've been using Thunderbird on Windows 10 since last year sometime. Currently I'm on version 151.0.1.

I've 4 x mailboxes here and since yesterday, 3 of them show me an unusual message when checking for emails. I tried attaching a screenshot but although the screenshot uploaded, I couldn't find a way to insert it here. But the message says Unable to write the email to the mailbox and asks me to check if I've write privileges (which I have) and to cheek the available disk space.(currently 101GB free).

The message is happening 2 or 3 times each day and lasts for about half an hour, then everything works fine again. Has anyone else seen this??