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I've been a faithful Thunderbird user since the beginning - and continue to use Thunderbird with our company's Microsoft365 deployment

until Monday of this week -- when suddenly I find that my credentials are being refused.

The symptoms

• XXX: Connected to outlook.office365.com
• nothing in the activity viewer
• no email coming in

I've read and tried all the fixes proposed in the article at https://support.mozilla.org/en-US/kb/microsoft-oauth-authentication-and-thunderbird-202 (restarting thunderbird after each step, naturally)

• have authorized Thunderbird to our Microsoft365 tenant
• created and tried registering with a new thunderbird profile
• have set my security settings to 'accept all cookies'
• have used the config editor to remove 'oauth2.issuer' and 'oauth2.scope' values
• I've checked that my account in Microsoft365 has IMAP and Authenticated SMTP enabled

So, since Monday, I've been living in hell, trying to pretend that the Microsoft Outlook app for macOS is useable, but it's practically debilitating to be forced to use that piece of software.

Can somebody please point me to another possible set of steps that I can use to try and diagnose this?

I absolutely hate myself for having to ask for help on this, but I'm at my wit's end...

Thunderbird is completely unusable in the latest release. Attempting to set up a gmail based account results in

"Warning: Potential Security Risk Ahead

Thunderbird detected a potential security threat and did not continue to 192.168.1.250. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details."

That's it. No options, no explanation, no KB articles, nothing. It just doesn't work. But why is Thunderbird trying to open a web connection to my local machine? If it's trying to talk to itself, why can't it? This is clearly an issue with trying to authenticate to Google as it happens after auth, but come on, this is a given requirement these days. If your app doesn't work out of the box (MacOS 13 btw), it may as well not exist for the OS, so this is very confusing.

Trying out older versions was a real comedy of failures as well. Too old and it's just a disaster. Too new and it just self updated to 115 again which doesn't work. So kinda seems like this is not a functional app anymore, at least not on Mac. Baffling. I guess it can only be used with legacy style email systems.

Hello all together! I have a question concerning the grouped folder functionality in TB 115. I use TB for some years now and updated to the latest version 115 the other day and the installation worked fine. All my accounts are still there and synchronize as before. But when I switch to the grouped folder view I do not see any mails there in the inbox. No content from any of my accounts at all. Also I can not find any swith in the grouped inboxfolder settings that allows me to check if the accounts are "in" there. I hope that you have some ideas for me, what is going wrong and how I can fix it. I attach two screenshots that hopefully describe the issue sufficiently.

Thanks in advance for your support!

Oliver

Hi,

 After installing Thunderbird 115, when sending an email, very often I will receive an email alert stating (see image - spanish screenshots):

Delivery failure: An error occurred while sending mail: outgoing server error (SMTP). The server responded xxxxx.domain.net Errro: timeout exceeded.

Two days ago Thunderbird no longer would send emails (been using it without problems for 7 years) I have read all the previous posts on this. Tried sending emails after disabling firewall and Malwarebytes without success. I can receive emails sent from my Spectrum email account (still works). I can send emails from my iPhone using the identical Outgoing Server Settings. The settings are in the screenshot. Also downloaded the latest version of Thunderbird today. Didn't fix it. To get around the problem right now is I am composing my emails (IMAP), saving them in my drafts and then sending them from my iPhone.Any ideas? Thank you!

I have to use MSN now for my email server since your software no longer works!!! I can't send anything through your software now that you "upgraded" your TB software without my permission. Not sure why, but MSN is now saying that Outlook won't work with TB. So, good luck with that.

Hey Team,

This is a problem that I have seen a few times over the years but is causing me some real headaches at the moment for one specific customer who uses TB.

The computers in question are fully patched windows 10 with TB 115 installed.

When clicking on an email header / selecting an email from the message list, sometimes, a different email body is loaded into the message pane. Sometimes moving the message to a different folder seems to resolve the issue but I'm not sure that this works 100% of the time. We have also had instances where an email has been replied to but the wrong email body has been included in the reply (bit if a data security concern...)

I am assuming that somewhere along the lines the link between the downloaded headers and the message bodies is getting out of sync. My current "fix" is to remove the account, remove the data then add the account back. This seems to fix things but doesn't seem like the right way to do it.

Can anyone offer any advise on either;

1. How to prevent this from happening in the first place
2. More efficiently re-sync all of the headers to bodies (assuming that this is the issue)

Help and advice, greatly received.

I find it to be a big oversight that the project is so mature but still doesn't have RTL support out of the box. The (unofficial) add-ons that supply this functionality are yet to be updated to be compatible with version 115. Isn't it time to make this part of the base program?

While away from my computer for a few days, Thunderbird stopped retrieving new emails. I noticed this when I returned. I'm using imap to download from the server. Logging in to the server via browser shows that there indeed new emails. Quitting Thunderbird and restarting results in showing old emails and a spinner (slider?) on the Inbox tab that never stops. I have not changed configuration recently (I was away when this started). I followed a suggestion to delete cert9.db, key4.db, and logins.json. Doing this and restarting changed nothing. My understanding is that this should have deleted my server password information, but I was not prompted for a password on restart. I have uploaded a snapshot of the "Troubleshooting information" tab to pastebin:

https://pastebin.com/fsB64yiu

This program is deeply flawed. It's slow & must be rebooted multiple times a day. Then at times it works just fine. What's the problem & how to fix? The address book doesn't show what folder you put a contact in. The old version did. This is a flaw too.

The update to Thunderbird 115.0.1 broke the "Unified folders".

I have two eMail accounts: - the first on a custom server, I do not know its characteristics - the second is an Office365 institutional account

Only the account on the on the custom server is shown in the Unified Folders.

The second account is shown as a folder in the Unified Folders pane, at the same level as "Archives", "Junk" and "Deleted".

I have tested one solution reported to be working: https://support.mozilla.org/en-US/questions/1003446

It does not work in my case.

Any help?

Hello,

I am currently facing difficulties with the automatic configuration of the Thunderbird mail client. I have set up a web server that provides an XML file containing the configuration information, accordingly to what we can see here -> https://wiki.mozilla.org/Thunderbird:Autoconfiguration:ConfigFileFormat, and the URL of the file is accessible without any problem from my host. However, when I try to configure Thunderbird to automatically retrieve the configuration, it doesn't seem to send an HTTP request to the server. I used wireshark to see what happens here and I can see a DNS request for autoconfig.mydomain and a response with the correct IP, but no HTTP request after that. I used the log console of thunderbird and I get those messages : mail.setup: guessConfig failed: Impossible de trouver un serveur

Here's what I have checked so far:

The configuration XML file has been validated and does not contain any syntax errors. The URL of the XML file is correct and accessible from a web browser. No proxy settings on my system. No firewall rules seems to be blocking my system to access autoconfig. Despite all these checks, I still can't resolve the issue.

If you have encountered a similar problem or have any ideas about what might be causing this behavior, I would greatly appreciate it if you could share them.

Here are some additional details that might be helpful:

Operating System: Windows 11 Thunderbird Version: 115.0.1 (also tested on 102.5.1) The configuration XML file is accessible at this URL: http://autoconfig.<mydomain.com>/mail/config-v1.1.xml?emailaddress=<username>@<mydomain.com> Error message in the Thunderbird error console: "mail.setup: guessConfig failed: can't find a server"

Thank you in advance for your help !

After moving my thunderbird 104 profile to 115 supernova (including the profiles.ini file), I can see the full list of accounts and folders in supernova, but none of the emails are visible. I can receive and send new messages, but again - none of them are visible when I want to see them later in the inbox or sent folders. Moreover, the right-click mouse button does not work on the whole list of accounts/folders on the left side of the agent. What to do. I have 16Gb of emails and cannot use them.