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I am trying to use the Thunderbird mobile app on my Android device. I tried generating the QR code on the desktop app and scanning the QR code with the Thunderbird Android app, but the QR code never gets scanned; it is not getting processed.

Current Behavior When Firefox is set to offline mode (File → Work Offline), the Developer Tools Network tab does not display request body of requests that web applications attempt to make. This creates a significant gap in debugging capabilities, as developers cannot inspect request payloads details that would normally be visible.

Requested Enhancement Enable the Network tab to capture and display attempted network requests payload even when offline mode is enabled

When I open the Thunderbird desktop app we receive this popup error message:

"Unable to establish TLS connection to POP3 server. The server may be down or may be incorrectly configured. Please verify the correct configuration in the Server Settings for your mail server in the Account Settings window and try again."

I have not found any configuration under the account settings to help with this, but if anyone has any suggestions to walk me through this to establish a connection again that would be most appreciated.

Additionally, when I try to send an email I receive the message: "Login to server smtp.cybermesa.com with username centinela failed."

After closing the error message box I received another error message: "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.cybermesa.com timed out. Try again."

Is our issue then with Cybermesa and not Thunderbird? Or Is something wrong with Thunderbird due to our initial error message we received? Any suggestions is much appreciated.

I am trying to add my gmail account to Thunderbird, with the normal procedure. It immediately gives the correct settings with OAuth, send me to Google to get the permission when confirming these, then displays «Unable to connect to the server. The configuration, username or password are probably incorrect.», although I have double checked all of these. The same thing happens to a friend I am trying to help (with the latest Thunderbird version available) (140.2.0esr on Ubuntu 24.4.3 in my case). I wonder what happens, as I used to install Thunderbird and add accounts easily, from Google or other services, on a number of people's computer, a few months ago.

I just downloaded Thunderbird and trying to setup my existing email. It keeps giving me the message "Unable to log into server. Probably wrong configuration, username or password. I just logged into my email on yahoo and the user name and password worked fine.

I have 8 email accounts on Thunderbird, 5 Gmail and 3 Outlook. My newly added Gmail account has stopped downloading email, while all the others still work as they should. I keep getting pop-up messages from Thunderbird “Server imap.gmail.com has disconnected”. The problem started yesterday and only 1 of the 8 accounts. This new Gmail account is transferred from one of my Hotmail accounts. I have 7800 emails on the server waiting to come down. Alfred

Using Thunderbird desktop for Windows with my Hotmail account, I frequently cannot send an outgoing email. I regularly get the following message even while successfully receiving incoming messages.

Send Message Error Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Cannot connect to SMTP server 2603:1036:308:2817::2 (2603:1036:308:2817::2:587), connect error 10060.

I use Thunderbird for Android with the same email account without any issues. Any thoughts?

Hmm. We’re having trouble finding that site.

We can’t connect to the server at data.digital.costco.com.

my isp no longer supports Thunderbird. When I try to log onto my thunderbird account it won't let me connect to the server. I can check my email by logging on to their website and using their email program, but I would like to keep Thunderbird. I have been using it for year. Is there a way I can get their server to recognize thunderbird when I try and log on to it. The ISP is Breezeline....thanks

When saving images from websites using the save image as feature, Firefox will freeze up and not register any mouse click or anything instead making a ding noise every time is register a mouse click. This will continue for like 30 seconds before it becomes normal then it will repeat this for every image. How can I solve this?

[redacted] problem you [redacted] im having issues with the video and ads as all of my apps are disabeld nothing works and firefox it self causing probs and no one is helping out.

been using Thunderbird for years. Old computer runs Windows 10 and will not support 11. New computer running Windows 11. Thunderbird will not link up to my e-mail account. old POP server. Using the exact same credentials, Outlook had no problem linking to my e-mail account. I want to use Thunderbird. Any ideas?

Also, if I can get it going, is there a way to import hundreds of saved emails from Thunderbird on the old computer?

Starting last night, Thunderbird 140.2.0esr has trouble connecting to Comcast email servers. In my case, I am getting an error that the connection was reset. Sometimes, if I close TB and re-open, it will connect for a bit and download new mail, but later fail. This is using the POP3 servers. On the Comcast forums, others are reporting similar issues. https://forums.xfinity.com/conversations/email/unable-to-connect-to-pop3-server-this-morning/68af0959e127b572a1266228

I don't have TB on my Android phone, but Outlook is also having issues with forcing me to sign in, and that can take 2-3 tries, and will . The Yahoo Mail and FairEmail apps do work on the phone without problems. These all use the IMAP servers.

I don't have any problem sending messages on my PC at home just on my laptop. I have windows 11 on both.

I get a message...

connection to outgoing server (SMTP) timed out.

another time I got the message

'sending failed. error while sending mail. outgoing server (SMTP) error. server responded impout 006.msg.chrl.charter.net cmsmtp 50.201.174.29 blocked please see... https//spectrum.net/support/internet/ understanding-email-error-codes for more information AUP#Out - 1130

I looked up 1130 in spectrum’s website but I couldn't figure out what it was saying. I also called spectrum to see if they could help but they couldn't help and just referred me back to you guys.

my outgoing connection is

description - charter communications server name - mobile.charter.net Port - 587 Security - normal password user name - robinclaire1@charter.net (or any of my other email addresses)

I have 5 email addresses. and I can't send from any of them. jesusfollower1@charter.net robinclaire1@charter.net climbthewell@charter.net robinc12step@charter.net jerryg0583@charter.net

please help. thank you robin

ps - I had a terrible time with thunderbird trying to load a profile from another computer. This failed utterly and I had to have someone help me to reload thunderbird on this laptop. I've never had luck with sending ever since it was reloaded. to reload, I had to search for 'thunderbird' on my computer over and over again until there was no 'thunderrbirds' to delete - that included several thunderbird downloads as well. I wiped my laptop clean of all thunderbirds and then it could finally be downloaded. But I didn't think to try to send a message when I tech guy was there so I didn’t catch that I couldn’t send them.

thanks again.

r

I received this message: Unable to connect

The connection was refused when attempting to contact localhost.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Thunderbird is permitted to access the web.

I am not receiving new email. What do I need to do to get it working again?

I am using 140 ESR version on linux with Cloudflare's DNS over HTTPS and with DOH active for some reason resolving a domain like d3oklwo3y1bx83.cloudfront.net will resolve to local host IP 127.0.0.1.

I am using firefox about:networking#dnslookuptool to test resolution of the domain d3oklwo3y1bx83.cloudfront.net Both with DOH on and off the resolution remains local host. I tried another browser on the same workstation and I was able to receive a resolution of 13.225.193.203 13.225.193.133 13.225.193.64 13.225.193.58 Why is firefox ESR not able to resolve that domain? What are causes ?

Is is firefox dnslookuptool results.

HI all. This is a good one. I recently got a MAC, my first one, so dont know much about it. I installed thunderbird and can receive via IMAP but cant send via SMTP. I have smtp setup EXACTLY how it is on my windows PC which works. When I hit send on a message, it immediately comes back with "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) <maileserver.com> timed out. Try again. This message comes back immediately, as in .000001 second. This particular mail server I own and is on my network, and checking the logs, the request never even gets to the server, so its not a server issue. (Again, it works for all my other devices and other clients). server info, password etc are correct. I tried deleting the account and recreating it but no go. From a command tool, I can telnet to my mail server on port 25 and it answers and I can interact. If I use the built in mac mail client, it works fine. So this is definitely a thunderbird issue from what I can tell. Thunderbird 143.0.1 (aarch64) on 26.0.1 (25A362) Any tips appreciated, Im ready to take a bath with a toaster. Thank you!