Thunderbird Community Forum

I recently installed Thunderbird on my Android pad where all my email contacts came in fine. However, I just went to my Windows 10 laptop where I've previously used Thunderbird and my contacts are missing. How do I get them back to my laptop?

I've been using Thunderbird for years at this point and it was fine, but then some time after the latest update I stopped getting new emails. I tried a bunch of random "solutions" I found on the internet and I don't remember exactly which one, but eventually I got the web portal to pop up, and it showed that I'm logged out of all my accounts (they all gmail, btw). Using this windows I was able to log back into one of them, but then it didn't popped up again to let me to log into others. For a day or so I was getting email from that one account I logged back into, but then again, suddenly, no new emails. I decided to just start over on a new profile and that's where things went from bad to worse. Now I can't even get past the initial logging process. It gives me "unable to log in at sever" over and over, no matter what I try. I tried a bunch of different config suggestions, I tried the old school way of getting a device password, I've checked if localhost was running something - it wasn't. I tried uninstalling and reinstalling, installing an older esr version (I'm on Win10, thought maybe that has something to do with it) - same thing. Unable to log in at server. I can switch back to my old profile that doesn't get any emails anymore, I've backed it up, but what's the point. Kinda feeling screwed on all fronts here.

Also, whoever is replying to people on reddit with "thunderbird employee" badge, ghosted me after one message. Great support /sarcasm.

Version: latest (whatever auto updated updated to) and 140.8.1esr OS: win10. Mail provider: gmail.

I have been receiving this error message for the past week or 2

An error occurred with the POP3 mail server. Mail server pop.iprimus.com.au responded: Cannot connect to POP server 203.134.11.3 (203.134.11.3:110), connect error 10060

Whenever I start Thunderbird, I get messages such as that some mailboxes cannot be compacted and some filtering cannot be done "because another operation is in progress". Why is this? How can I prevent it? It is a nuisance having to go and chase down and correct the filtering that has not taken place.

Can get(POP3), but can not send emails to a newly created personal outlook.com account.

the following error occurs when trying to send mail: Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)

all my setting are correct per thunderbird and microsoft:

  (smtp-mail.outlook.com, port 587,  STARTTLS, OAUTH2, xxxxx@outlook.com)

thunderbird error log file contains the following: . . . mailnews.smtp: S: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]

SmtpClient.sys.mjs:452:17 mailnews.smtp: Command failed: 535 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:578:19 mailnews.smtp: Error during AUTH XOAUTH2, sending empty response . . .

Based on my understanding its seems thunderbird is using SMTP AUTH instead of OAUTH2 as required for newer personal outlook.com accounts. Is my assessment correct? If so, is there a fix?

My email provider is GMX and I have completed 2fa with an app-specific password for Thunderbird. The setup was authenticated.

For Thunderbird, under my email address setup I have included my name, email address (rdoty@gmx.com), the app-specific password for Thunderbird and the personal password for my email account.

Under my account settings I have entered my Account Name as my email address and also for the email address entry. Under Privacy and Security/Saved Passwords they are as follows; imap://gmx.com (imap://gmx.com) along with the app-specific password, but the SMTP does not show and I'm not sure how that gets entered.

The SMTP info is included under Account Settings as follows; Description = GMX Freemail, Server Name = mail.gmx.com, Port=465, Connection Security = SSL/TLS, Authentication Method= Normal Password and Username = rdoty

I did disable Encrypted Web Scan in my AV software Bitdefender

When I select Get Messages Thunderbird always times out and won't connect. What do I need to do to get TB to recognize GMX?

1) Firstly, I posted earlier because I needed to add a second app-specific password to my account. What I discovered was that my Account Settings tab had disappeared. I got a response from someone that I had to change my email password, and it would reappear. IT DIDN'T. So I've changed my password and I still have no access to my Account Settings! What do I do? I really don't understand why, if I could log in with my old password, what the point is to change the password to correct the Account Settings problem. I need HELP!

2) I need HELP getting either Thunderbird (my normal email client) connected or change to a new email client that will actually work. The problem is that Thunderbird for some reason can't connect even with an app-specific password! I have been struggling with this for more than two days and there is NO HELP from GMX that solves the problem. And it's not just GMX, there's no help from Thunderbird. My sole source of help has been to post queries on the internet and follow what AI tells me which has been only part right. At least it's something. But now I can't even change my account settings!!!!

Can somebody PLEASE help me? [edited email from community support forum]

Every eMail I get is now being marked as read when I move it to trash, including Spam, even if it is not read. I do not want this behavior. I did not change any settings. Thunderbird started doing this automatically, several days ago. I want everything that is unread to remain unread, ESPECIALLY Spam. I asked this question 8 months ago, but I have received no answers or support.

As of March 24, my Mozilla Thunderbird email seemingly cannot connect to the internet. Therefore, I have no ability to receive of send emails. I am a member of the Best Buy tech support capability and their technicians spent several hours trying to correct this issue and finally stated that I need to seek actual Mozilla Thunderbird technician support to correct the lack of connectivity.

This started happening about a month ago, without me (or the update) 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 retaining them. I automatically accept Thuderbird software updates (now 149.0.1)

Hello, I use Thunderbird for years but suddenly I can not send mails out. I have re-installed Thunderbird but same issue. I checked all data in settings. Everything is good. I have deactivated Bitdefender but no influence.

This is want Thunderbird says when I try to send a mail: Senden der Nachricht fehlgeschlagen. Fehler beim Senden der Nachricht. Der Mail-Server antwortete: Policy violation: Service unavailable. Bitte überprüfen Sie, ob Ihre E-Mail-Adresse in den Konten-Einstellungen stimmt und wiederholen Sie den Vorgang. Means: Mistake when sending the mail: Mail server gives no answer. Policy violation. Service unavailable. Plese check your mail address in the settings and try ones more.

When I use vodafone as a mail program, I can send E-Mails out without any problems. Very strange. Can you help?

Regards Stephan