Just an update:

To confirm that I changed the configuration item "security.tls.version.min" from 3 to 1 as per other posts.

No change.

Error Console:

Uncaught Exception { name: "NS_ERROR_ILLEGAL_VALUE", message: "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIMsgDBView.open]", result: 2147942487, filename: "resource:///modules/DBViewWrapper.jsm", lineNumber: 1113, columnNumber: 0, data: null, stack: "_createView@resource:///modules/DBViewWrapper.jsm:1113:14\n_applyViewChanges@resource:///modules/DBViewWrapper.jsm:1463:24\n_enterFolder@resource:///modules/DBViewWrapper.jsm:1202:10\nopen@resource:///modules/DBViewWrapper.jsm:821:12\nshow@chrome://messenger/content/folderDisplay.js:823:19\nFolderPaneSelectionChange@chrome://messenger/content/commandglue.js:350:18\nonselect@chrome://messenger/content/messenger.xhtml:1:1\nMozTreeChildren/<@chrome://global/content/elements/tree.js:69:28\n", location: XPCWrappedNative_NoHelper } DBViewWrapper.jsm:1113

I have the same issue with a bunch of other accounts. Thunderbird (75.8.0 on Windows 10 Pro) just stopped downloading mails. It seems like it is trying to connect but to no avail.

To confirm that I also tried the following:

Changed the configuration item "security.tls.version.min" from 3 to 1.

No change, still does not down load emails.

I use Thunderbird and recommend it to all of my email users, and have done for well over 10 years. I got a call from a user this evening who was reporting the same issue, suddenly Thunderbird stopped receiving mail. He is running version 78.5.0 (32-bit).

After two hours of troubleshooting, what I found from turning on authentication debugging on the server was that Thunderbird stopped sending the username. I have tried deleting the account from Thunderbird and re-creating it, but that is not possible because Thunderbird won't save the account unless it gets a successful login. I considered deleting and re-installing Thunderbird, but that is not an option because he uses pop and would lose all old email. I tried both pop and imap with the same results.

I set up a copy of his account on my local copy of Thunderbird (same version) and it appears to work fine.

Just an update I incorrectly gave my version of Thunderbird as 75.8.0 where I meant 78.5.0.

Looks like a bug with Thunderbird at this stage. Anyone else with any ideas?

Just an update I incorrectly gave my version of Thunderbird as 75.8.0 where I meant 78.5.0. Looks like a bug with Thunderbird at this stage. Anyone else with any ideas?

Given that you (probably) didn't update Thunderbird on 11/30 ...

If you are using ESET/NOD32 security/AV then probability is very high it is causing your problems. According to their forums, you should temporarily disable SSL until they solve the problem per https://support.eset.com/en/kb3126-disable-ssl-filtering-in-eset-windows-products?ref=esf - the problem is being reported by dozens of users https://forum.eset.com/topic/26517-problems-with-thunderbird-and-imaps/ https://forum.eset.com/discover/

brett21 said

Just an update I incorrectly gave my version of Thunderbird as 75.8.0 where I meant 78.5.0. Looks like a bug with Thunderbird at this stage. Anyone else with any ideas?

Given that you (probably) didn't update Thunderbird on 11/30 ...

If you are using ESET/NOD32 security/AV then probability is very high it is causing your problems. According to their forums, you should temporarily disable SSL until they solve the problem per https://support.eset.com/en/kb3126-disable-ssl-filtering-in-eset-windows-products?ref=esf - the problem is being reported by dozens of users https://forum.eset.com/topic/26517-problems-with-thunderbird-and-imaps/ https://forum.eset.com/discover/

Hi Wayne,

You are a legend! Followed the steps from ESET and this solved the problem!

Really appreciate your time,

Cheers