Thunderbird コミュニティフォーラム

I get a pop up message from Thunderbird stating the the connection to server pop.earthlink.net was reset. I have to reboot my PC to be able to download emails. Is there a setting I need to change? Thanks.

I have Thunderbird on my Omen 35L on Win 11. Thunderbird CANNOT CONNECT to Comcast to send an email. This was not a problem on Win10. I have done ALL the settings fixes and NOTHING WORKS. Other mail provider accounts send OK (e.g. Site Ground). This is unique to Win 11 and Comcast.

Unable to send emails. A message appears saying the outgoing server (SMIP) smtp.gmail.com timed out. Try again. This keeps repeating. What can I do?

hello, https://addons.thunderbird.net gives error 502 Bad Gateway.

[[Thunderbird Addons Website 502 Error|Zach Rice asked the same question on 17/march/25, 12:28 PM]] and got an answer from James 3 hours later. Am I living in an alternate reality ?

I have had an ongoing problem with Thunderbird being unable to log into the various mail servers that I use. I've tried repeatedly to solve this problem and have been able to cure it in the past by clearing the cache, but it recurs over and over again. I cannot keep wasting my time like this. I'm an independent contractor and I need to be able to use my e-mail client consistently. I've got work to do! This morning, it's suddenly decided that it cannot log into any of the three services that I use.

Is there a lasting solution to this problem? If not, please tell me and I'll move on peacefully, but please don't keep me chasing my tail for something that cannot be fixed.

For 3 days now I have been unable to connect thunderbird to microsoft outlook. I have all the latest settings checked online with microsoft and it keeps failing... any suggestions on how to overcome this? Thanks

Thunderbird will not connect with virginmedia.com outgoing or incomimg email servers. It was working fine several days ago. All of the settings look to be correct but a message appers saying that the Connection to pop3.virginmedia.com server has been reset. I have a recovery code from virginmedia but cannot see any way of entering it in Thunderbird.

Since updating to Thunderbird v 146.0.1 and Release Channel rather than ESR, Thunderbird will not launch \ refresh. The message "Connection to server imap.mailfence.com timed out" is repeatedly displayed. Troubleshooting mode produced no information about or change to this. Accessing mailfence directly works fine - but I'd like to continue with Thunderbird.

thanks, ---dean

I sent a request for help and got this response:

"Well you might start by actually advising what the error is. We are at this point left to guess what "When launching Thunderbird, I get a pop-up saying Server "outlook.office365.com" reported en error" means and I can assure you it is not much to base a guess on. What is the message verbatim?"

You missed the point entirely! The point is that there NO ERROR CODE REPORTED, only the cryptic information I sent earlier. Further, if I knew the error code, I could fix it myself. The question is whether there is some kind of a log file kept in Thunderbird that may shed some light on the problem. Hopefully, now you understand the problem and can respond in a more meaningful and professional manner.

Some additional information: (a) sometimes email does not send, (b) I have already reinstalled T-Bird with with the mystery error continuing, (c) no errors were reported during installation. If there is no log file that T-Bird keeps and if you have no way of helping me track this down, T-Bird has ceased to be a practical alternative to Outlook.

I periodically get a T-bird notification "Server imap.gmail.com has disconnected". If I wait for 30 sec to a minute, the connection reconnects and everything is fine, until it does it again. If it disconnects in the middle of sending a message, the send action will freeze and perhaps, time-out if the disconnect time is too long. Any ideas about this periodic disconnection? I'm using version 128.9.2esr (32 bit) with Win10 pro.

Thanks, Tom Hayes

not connecting to server as of today

Login to server mail.tds.net with username [edited]@tellink.net failed.

A search showed that others have experienced this same error message, but as far as I can tell, they all were unable to access their email. These messages began appearing about a month ago. They pop up in Troubleshooting Mode. They did not in Windows Safe Mode. AVG and ZoneAlarm are not the culprits.

Thunderbird sagt, E-Mail-Adresse, Passwort oder Konfiguration seien falsch, Anmeldung am Server nicht möglich, obwohl ich mich über Mozilla Firefox auf dem Vodafone-Server einloggen kann. Was kann ich machen?

Quand l'envoie une PJ avec un compte qui a smtp.free.fr, j'ai le blocage "L’envoi du message a échoué. Le message n’a pas pu être envoyé car la connexion au serveur sortant (SMTP) smtp.free.fr a expiré. Veuillez essayer à nouveau." Si je l'envoie avec un compte qui a smtp.sfr.fr, je n'ai pas de problème ! Je suis en Thunferbird 146.0.1 (64 bits) sur Windows 10. Merci de votre aide.

After the 146.0.1 update (installed on December 10th, 2025, OS: Windows 11 25H2), when Thunderbird tries syncing a college email account (email format: first.last@schoolname.schoolabbreviation.edu) I get the following error message popup as a Windows notification: "Server outlook.office365.com responded with an error." When clicking on the error message, it doesn't provide any additional information (no error code or detailed message of what's going on).

Below is the troubleshooting steps I have already tried.

• Restarted computer
• Repaired Thunderbird installation
• Tested connection to server under Account Settings>Server Settings. Shows successful connection.
• Cleared Thunderbird startup cache

Since the account still seems to send and receive emails just fine, I haven't tried removing/readding the account or doing an uninstall/reinstall of Thunderbird.

Any suggestions on where I can find details of what is causing this error and how to fix it? If I need to provide more troubleshooting information, please let me know.