Thunderbird Community Forum

Hi I have successfully linked my TB Calendar to Nextcloud. However, Tasks are not syncing.

When I go to create a task in the shared calendar TB advises: Please select a calendar that supports tasks

I understand later versions of TB now handle CAL and CARD Dav better.

Some have suggested using TBSync addon, however that appears to only support account creation for Google and MS calendars, but not Nextcloud.

Is there a setting in TB or NextCloud I am missing, or an addon ???

Any thoughts appreciated. Thanks

On my Windows 11 laptop, in Thunderbird v 148.0.1, I changed the entries for Accounts>"Your name" for all of my accounts. I then Tools>Export the settings to a file. It was reported as 1.97Gigs, and Krusader displayed it as 1.9Gigs.

On my Linux laptop, I imported the settings into Linux Thunderbird v 140.9.0esr (64-bit). It did not import the new names. When I attempted to edit them, Account Settings mode says "Account name already exists" and appends _2 to the account name.

I forgot to make a backup before I undertook this.

How can I fix this?

Since setting up Yahoo email on TB using POP3 setting, I noticed that while all my Inbox messages remain when downloaded on my PC, the Sent messages are being gradually deleted to leave only the most recent (currently) 11 messages, like it is if I log in online to Yahoo webmail. Does this mean I need to configure it to IMAP as well to make sure nothing is deleted once downloaded to TB on my PC?

「メッセージを送信できませんでした　メールの送信中にエラーが発生しました　サーバーからの応答：Messenge deferred」 というダイアログ（アラート）が頻繁に出てくるので迷惑。 「サーバーからの応答：Messenge deferred」とは何か？ 反故の設定：STARTTLS、SMTPも含め、いろいろと解決策を摸索したが駄目だった。 TLS1.2に対応 送信時のポート:587

I have saved relevant e mails to local folders in my Thunderbird account on my Applemac. I opened up Thunderbird on my MacBook and downloaded my Thunderbird account but it did not copy those local folders, merely 1 empty folder. Without these also shown in my Thunderbird account when I am away from home, I cannot see those records. I am struggling to find a solution. Are you able to help please? Alan Dowler

On 6th Feb 2026 a professional set up Thunderbird [149 I think] on my Desk top computer, running Windows 10, with 2 email addresses. Last week I found I could receive emails on both, but not send on either. I know the passwords for both the addresses, but even if I put them in when asked, I still could not send. Then I found I was not receiving e mails on either address as well. I am 87 and may have changed something important, in an effort to find a solution, as last Friday [27th March] thunderbird crashed. I sent the report to thunderbird. Yesterday I received the previous day's emails and current ones. Today [29th] I am receiving, but not able to send again, My email default is set as Thunderbird. For many years I was with Plusnet, but recently I had to transfer to Greenby. I checked their Web mail when I was not receiving emails and they were on their Server. I can make simple changes in Account Settings eg Port, Outgoing Server, Security.. Is there a simple solution or should I call the Professional again? Thank you.

I store many e.mails in a variety of Folders. Most are viewable but at least one folder (ATTIVO) says there are no e.mails despite having just saved them there. These e.mails are visible via my i-phone. As I have passwords etc saved on my lap-top this issue is problematical but not fatal but does indicate a glitch in Thunderbird that makes me suspect it's general reliability

Email (from gmail) is not downloading. Thunderbird updated yesterday and I can't download today's emails; it gets stuck on "check mail server capabilities." If I go into Gmail it's there, but it's not coming in on Thunderbird

When I select Thunderbird email it responds very slow. When I select a message, the message does not show up. My email is carolinascene.com and my hosting company is AIT. Advance Internet Technology. What can I do? Call me because I do not get email. [edited phone# from public community support forum] anytime. Thanks! Gerald Robinson I have donated and will again!!

The University of Minnesota makes me change my password for their email IMAP server every year. I use Thunderbird as my email client. I have not had problems in the past, but this time Thunderbird does not connect with the UofM server and I cannot update Thunderbird with my new password. When Thunderbird tries to connect, I get a Google "help" message about clearing my Chrome cache that does nothing. I deleted the old IMAP password in Thunderbird, but that did no good. Is there a way to update my credentials within Thunderbird?

I have been using Thunderbird for ages now with no problem, but I suddenly realised that no recent emails were appearing from my Gmail account. I have tried everything suggested on line to resolve the problem, including uninstalling and reinstalling Thunderbird, and deleting and re-entering my acccount details but neither the IMAP or SMTP servers will connect to Gmail. I have reset all of the server settings on Thunderbird, and have checked that Gmail is IMAP compliant (which, apparently, is is now automatically). I have spent hours trying to sort this out and am just at the point of abandoning Thunderbird completely, but I am loathe to do so if there is a solution. The latest error message i have received is "Unable to log in at server. Probably wrong configuration, username or password" but I don't know what else I can check or change.

Thunderbird will not get my mail. It continues to send mail but will not fetch it,

I tried to delete the account in thunderbird, It will not reestablish the account. I can use a web login to get to my email on the server but the identical credentials will not establish the account in thunderbird, I can establish an account in Outlook but not thinderbird.

We have an email account that is gmail behind the scenes but uses a front end alias (e.g. name@organisation.ca). Adding the email account to Thunderbird is no problem, TB recognizes that it is a gmail account. However, it does not automatically add the address book. I tried to add manually using the new Accounts Hub CardDav putting in the email address under UserName and putting in imap.gmail.com:993 for the URL/Hostname. It does not work and I get the error: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsISupports.QueryInterface]

For the last couple of weeks I have been having trouble connecting to gmx.com. It keeps saying connection to server imap.gmx.com timed out. I deleted and reinstalled the account but same thing. I also contacted gmx but so far no response. Is there something I am missing in the settings? Is anyone else having this problem? Thank you

Nie mogę wysłąć wiadomości. Przy póbie wyslania odpowiedzi na otrzyany e-mail wyświetla się taki komunikat

Wysyłanie wiadomości się nie powiodło. Wystąpił błąd podczas wysyłania wiadomości: błąd serwera poczty wychodzącej (SMTP). Odpowiedź serwera: * OK IMAP4 ready

ich habe ein outlook konto, dass ich mit thunderbird öffne. vorhin habe ich neue ordner erstellt, bei thudnerbird, und dort emails reinkopiert. die sind allerdings dort nicht angekommen. ich habe dann thunderbird geschlossen und outlook online geöffnet. die ordner sind da, die emails aber nicht. sie sind auch nicht im gelöscht ordner oder in einem anderen ordner, sie sind einfach weg. was kann ich jetzt machen

When I try to send an email, Thunderbird says failed and asks for the outbound.att.net password. I've entered the correct password and the send fails again.