Thunderbird Community Forum

Hello,

I recently upgraded to a new PC from Windows 10 to Windows 11. For some reason I can not open links in any emails, even if right clicking them. I have gone through all steps here: http://kb.mozillazine.org/Standard_diagnostic_-_Thunderbird but nothing has changed. I have disabled Win Defender completely and still no change.

Any idea what I am missing? I am at a loss at this point.

Thanks for any advice or direction.

This only recently started happening. This has been tested on 3 different computers. Windows 10 Pro on all three.

With VPN on: Bluemail works fine.

Thunderbird can connect and download messages, but when I try to send a message, it gives an error.

With VPN off:

Bluemail and Thunderbird both work fine.

Starting yesterday for no apparent reason TB has been unable to connect to my email accounts. (IMAP or POP). These include Roadrunner, Gmail and Outlook.

Any Ideas? James

I have been trying to add my accounts to Thunderbird and had good success with gmail but wasn't able for Microsoft accounts. As I said in another thread (can't find the message anymore), I have 2 microsoft email account (one live.ca and one hotmail.com) and they both don't work. I was able to add them in Outlook desktop app and EM Client (a non open source software i'd rather not use) through IMAP with success. IMAP is activated in both accounts and as per Microsoft documentation the server is supposed to be outlook.office365.com on port 993. eM Client magically discover IMAP settings to imap-mail.outlook.com instead. Thunderbird opens an OAuth page and then it redirects from microsoftonline.com to localhost and fail with "Unable to connect".

2FA not activated in one account, if that matters. I have nothing running on port 80 if that matters.

Why am I getting this message when I try and send an email from my Mozilla email client: Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com timed out. Try again.

I am having issues getting thunderbird to connect to my 2 hotmail accounts over the last week or two. According to isitdownrightnow.com, outlook has been down for about 200 days and is this really the case? My wife is not having any issues with her hotmail accounts, but I am. I have tried several different settings and attempts and did seem to have it setup, only for it to fail again and again.

This is getting ridiculous. I am using Windows 10 Pro and I am using Thunderbird 150.0.1 (64-bit). I am using Avast Antivirus and Comodo Firewall, but my gmail and yahoo mails are just fine. If anyone here has any information that I am missing or maybe I am making some kind of mistake in my setup, I would really appreciate any and all help or suggestions. Please ask for details about my setup and I will be happy to provide it. Thanks, Shawn

Email is not linking to server and not downloading emails. All coordinates are correct. When I try to connect it tells me that the account exists. Cannot send email because it is not linking to server. More trouble than it is worth.

Hi

I use the Messaging Company for emails and Mozilla Thunderbird as the email client. For the last week or more, I receive a message "Unable to connect to imap.themessagingco.com.au Please try again later. If the problem persists, you may have exceeded the maximum number of connections.

Under the instruction of The Messaging Company, I have modified the advanced settings for the server. The Maximum number of server connections to the cache is now set to 1 rather than 5. I have also changed I also changed the Thunderbird's IMAP Timeout from 100 to 120

These two changes have reduced the number of error messages but I do still get them.

Can you help resolve this?

Thanks

Judy

Bonjour,

Depuis plusieurs semaine ce problème survient.

"Le certificat pour imap.gmail.com:993 ne provient pas d’une source sûre".

Ce problème, uniquement sur l'ordinateur avec windows 11. Sur le GSM pas de problèmes.

D'avance merci pour votre réponse. Cl. BERNARD

Courriel: [edited]@gmail.com

Hello,

This problem has been occurring for several weeks.

"The certificate for imap.gmail.com:993 is not from a trusted source."

This problem only occurs on my computer running Windows 11. There are no problems on my mobile phone.

Thank you in advance for your reply.

Cl. BERNARD

Email: [edited]@gmail.com

I have two different email accounts in Thunderbird. One is a Gmail account one is from Comcast.net. When I start Thunderbird it checks Gmail fine, but then I get a little pop up in the lower left-hand corner it says Comcast has blacklisted my IP. After a few more seconds a dialogue box pops up asking for my password. When I type in my password I get the same crap over and over.

I know my IP is not blacklisted because I can log on to my Comcast account in a browser no problem same IP. What's going on, do you think I picked up some sort of malware? I've scanned I can't find anything.

Michael Butler michael.butler101@comcast.net

i have a problem in the connection we need to have remote session

• Client : Mozilla Thunderbird (version utilisée) • Serveur SMTP : smtp-mail.outlook.com • Port : 587 • Sécurité : SSL/TLS • Authentification : OAuth2 • Message d’erreur exact indiquant un timeout / échec de connexion SMTP • Confirmation que : o le compte fonctionne en webmail o le service Microsoft est accessible o le problème persiste malgré un changement de réseau (si testé)

Receive the following error message whenever I attempt to reply to or forward an e-mail

"Send Message Error. Sending of the message failed. The message could not be sent because the connection to the Outdoing server (SMTP) mail.thorneplumbing.com timed out. Try again"

This has been going on for some time now, but does not happen when I use Thunderbird on my i-phone. Just on a PC. Please advise.

Thank you!

Hi, I use hushmail as an email provider, and thunderbird to download my hushmail emails onto my laptop. I recently changed the hushmail password, but I cannot see how to update it in thunderbird. I have read several help posts suggesting I need to change the password in 'saved logins', but I don't have any saved passwords there. I know the password is correct because I can access my emails with it online on the hushmail site, just not through thunderbird. I have attached pics showing that I don't have any saved logins, and the message I get when I try to download emails. Any help would be appreciated, thanks in advance.

This just started 4 or 5 days ago ( 2026.1.23 ish). I did not update TB nor make any changes to the account in question (that I'm aware of). The errors show up every few minutes, with a 'beep' sound and notification pop-up showing up each time - is very annoying.

I was running v145 when it started. I saw there was an update to 147 and installed that; same issue. I restarted TB into Troubleshooting mode and am still getting the error.

This is running on MacOS 15.7.3. Hardware is MacMini (2024) with Apple M4 chip.

Generally I still seem able to received & send emails.

I opened Activity Manager and Error Console. Error console doesn't seem to have much (using 'Multiprocess', with Errors, Warnings, Logs, Debug enabled). Activity manager shows things such as:

<my account name>

   Connection to server outlook.office365.com was interrupted.    09:49
   Failed to connect to server outlook.office365.com.    09:52
   Authentication failure while connecting to server outlook.office365.com.    09:58
   Authentication failure while connecting to server outlook.office365.com.    10:03
   Connection to server outlook.office365.com was interrupted.    10:10
   Connection to server outlook.office365.com was interrupted.    10:14
   Connection to server outlook.office365.com was interrupted.    10:20

There was an error or log entry that I was able to find a few days ago that made me think it was Calendar related, but now I'm not finding that message.