Thunderbird Community Forum

I have used Thunderbird for years for two emails. Suddenly about a month ago I get and authentication failure for server imap.gmail.com for the second email. I have tried everything I can find to fix this - including deleting the account and re setting it. I still get the error and am forced to use my browser to see that gmail account. My primary account works fine and the setting are the same for both. How do I fix this?

We recently switched to Clearnet Worx, dropped century link. Since then we have not been receiving emails from ppl and organizations that we want email from. Internet reception is fine but we can't figure out why we are not receiving email from ppl and orgs in our address book. We actually received a call from a friend who said his emails have been kicked back. I don't think our email box is full but I've not figured out how to check that.

I have been using Thunderbird with two POP3 Hotmail accounts for some time and I am trying to set up a third account with exactly the same configuration. However, both the automatic and the manual configurations failed. The new account receives mail, but the outgoing smtp server config seems to have a problem. Sending messages times out or keeps prompting for a new password.

The Hotmail account has POP3 and IMAP enabled. Thunderbird is set to receive all cookies. I cleared history and cache after every attempt and also temporarily disabled the firewall.

Any suggestions about what the problem could be?

Thunderbird stopped syncing with my GMX email accounts (I have several) a couple of days ago. It keeps reporting that the attempted connection has timed out. I haven't changed any settings on either Thunderbird nor GMX. Any idea why and how to fix it?

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

Hello, and thanks for the read...

ISSUE: Every day I have to call the telecom ROGERS that took over for telecom SHAW, turn IMAP and Pop3 on 9 Email accounts (they lost 1). Sometimes the 1 to 2 hors chat w/ a human turned it back on will not last long.

DETAILS:

1. I can receive outside Emails *because I can't send using Shaw/Rogers, checking for Email, just hangs at trying to login in to any of the 9/10 emails.
2. When I can get a support person to check, they tell me that IMAP and POP3 are turned off.
3. They will tell me they re-enabled it. But it doesn't enable for me.
4. It all works OK when using the online webmail Zimbra. However, I need to check 3 of the 9 email accounts every hour, others every 6 hours, and others once a day at boot.

QUESTION: When using POP3, does the setting on my SMTP need a special setting on Thunderbird?.

NOTE: I am complying with "Rogers With Shaw" passing the buck to the Email Client (Thunderbird) by asking here - "Could It Be The Email Client'! And my answer is 'No', because Thunderbird works perfectly with 54 other Email accounts.

Thank for reading this, and for any input you may add, ~r

P.S., I'd like to see a upgrade to this input form that allows us to Preview out Post And, when I started this Post, it alerady had a image from a previous Post

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.

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.

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

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.

This started happening about a month ago, without me changing my settings, which are to retain all emails unless manually deleted. Probably relatedly, copies of sent emails are not saved in the Sent folder. This is my account on yahoo.co.uk - all the emails are available when I go to yahoo through my browser, so it is just Thunderbird that is not ertaining them. I automatically accept Thuderbird software updates (now 148.0.1)

Hey all, I installed the current version of Tbird on a couple of machines for a friend, one machine worked fine for a month or so, then started giving the "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" error. There is a ton of free space on his C: drive, hundreds of GB. Yesterday I installed Thunderbird to another of his PCs, also no 3rd party AV (both running Win 11), same exact error after downloading a handful of emails from a few weeks ago. To make things weirder he took his laptop (the machine that worked ok for a short time) to his office, where he has a different ISP and it downloaded all of his mail! What is going on here? I have seen plenty of threads about this error, I tried compacting, repairing the folder etc, nothing fixes the problem and Thunderbird sits there not syncing his mail. At the bottom of the window it shows that there are 200 or so emails to download, it looks like they are downloading for a bit, then it quits trying and gives the error. Is there a known cause of this seemingly common error? Are Thunderbird devs aware there's an issue that renders their software unuseable for some users? His mail account is with Brightspeed, an old centurytel.net account. Please share any tips you may have for overcoming this error, thanks!

Hi folks. Suddenly I am having a problem with my e-mail account. I was working with T’bird this morning without any problems. Then I went to open my Firefox browser and I got a message that it wanted to upgrade to the latest version, which I did.

Now suddenly T’bird isn’t working. I got the message “ Enter credentials for (me) on smtp.gmail.com”. It has given me a Sign in page. My e-mail address was populated. Clicked on Next and got a message from Google “400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know”

I haven’t made any changes to T’bird. My smtp is still the same. I have just looked at my Gmail on my iPad and the only thing I notice is on the menu list there is a link to ‘upgrade’ - I am not risking that yet!

Any suggestions?