Thunderbird Community Forum

I have 5 email accounts in Thunderbird. After the update to 148.0, any incoming email gets duplicated into all five email inboxes. Also, Thunderbird re-downloads the various email folders (e.g., spam) repeatedly. How do I make this stop?

I have installed Mozilla ThunderBird Previously on many machines. Am Familiar with Incoming Email Servers and OutGoing Email Servers ... Also special ports ... POP ... and .... SMTP ... IMAP ... ETC ... GBGB On this Machine ... Dell Latitude ... 128 GB SSD ... 8GB RAM I have Mozilla ThunderBird Installed for as Single Email Account ... OverstreetENGR@Juno.com

When I REPLY to Emails , THIS IS the error message that I get : Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.juno.com timed out. Try again.

I'm using Thunderbird 152.0a1 (2026-04-22) on Windows 10 64 bit. When I click the "Get Messages" button or File > Get New Messages for > [my e-mail account] nothing happens. The only way I've found to check for messages manually is by closing and re-opening the program.

I get the following message when I try to download emails "Unable to write the email to the mailbox. make sure the file system allows you write privileges and you have enough disk space to copy the mailbox

I can see and check mail fine, I can send mail fine, and I've tried repairing the inbox folder. I'm using OAuth. What is the meaning of this error? I get it every time I start Thunderbird.

As of today, Thunderbird will not make contact with my servers and won't download emails. i had been having some issues with Thunderbird not sending emails last week. Plus, Firefox won't connect with my internet provider's website so I cannot access emails thru webmail. Firefox either times out or says connection could not be made. Could there be an issue within account settings?

Each time I open Thunderbird, it redownloads 423 gmail messages. When I exit, and relaunch, it repeats this. I also get an error message. It's been doing this for a week or so, but never up till then.

I've checked my settings, redone the saved password so it's now Oath2 and am out of ideas.

Can you help?

Hi. I´m running thunderbird 150.0 under win10 an a HP2760p with 8 GB RAM and 155 GB of free SDD-space.

I´ve got the errormessage: "Nachrichten konnten nicht in die Mailbox-Datei geschrieben werden. Stellen Sie sicher, dass das Dateisystem Ihnen Schreibrechte einräumt und genügend Speicherplatz zur Verfügung steht, um die Mailbox zu kopieren."

That is: Unable to write mesages to the mailbox-file. Make shure to have writing rights according to the filesystem and enaugh space is available to copy the mailbox.

I can´t find a limitation to filesize. I deleted a lot of mails, the error persists. I updated from thunderbird 140 to 150.0. The error persists. I downloaded my emails on an win11 Laptop. The download stopped after a while with the same error.

What can I do ? Thanks in advance - Robin

Перестали отправляться письма с почтового ящика gmail.com. Соединение с сервером исходящей почты не устанавливается. Разные порты и способы шифрования уже пробовал. помогите решить проблему. Спасибо.

error message follows

sending message failed.

An error occurred while sending mail. The mail server responded: Authentication required please verify that your email address is correct in your account settings and try again.

The email address is correct. What is going on?

In Thunderbird 151.0.1 [64 bit] I get the following error message: Error Inbox - inbox on .....[my email address] "There is not enough disk space to download new messages. Try deleting old mail, emptying the trash folder and compacting your mail folders and then try again." I did all of that, even went into windows disk cleanup to free up more disk space. I get the same error message. I have 3 email accounts in Thunderbird, only one account has this problem. When I use Outlook express I do not get any error messages but I do get a malicious email that AVG intercepts. So how can I purge bad email from Thunderbird ? Or what else may be going on and what else could I try ? I have deleted all old emails, in Thunderbird, I routinely delete old emails. Thanks alot Sam

How to connect email account!? I have been tring for days to set up email account incoming server settins accept but outgoing page despite green ticks will not let me finish, I am 80 and do not understand why I am being blocked when allsettings have green ticks??

Good day support team, I had this sending message error show on my Thunderbird desktop when I try to send Annual Report to my members. I had tested to send through Bcc to 50 recipients and not sure how many is going through or not even one is going through. This is due to the over limit of the recipients I send through Bcc or recipient "bcl5157@gmail.com" account as show on the attached screenshot picture had problem? For this scenario, is it better to create a Mailing list instead?

Thank you in advance.

Regards Jim

I run a rowing club with membership near 200 members. If we can not successfully use mailing lists, I am only left with the option of sending out individual email to each person. I'd like to know why I'm not receiving error messages when nothing is being delivered. I can send out email to one addressee, but not to a group.