IMAP email on Thunderbird with Virginmedia login failing-DNS issue+App Password +VPN

First off, this is an answer I wanted to share rather than a request for help. Spent significant time over the weekend helping family/friends with Virgin Media account an… (læs mere)

First off, this is an answer I wanted to share rather than a request for help. Spent significant time over the weekend helping family/friends with Virgin Media account and Thunderbird [Version 115.13.0 (64-bit)] on Win10. Virgin Media have introduced app passwords recently and all was fine until a recent update of Thunderbird. Ever since the account has refused to connect to the IMAP server. Other accounts with similar authentication methods worked but this one failed.

Issue Reproduction : System : Win10, Thunderbird 115.13.0, Norton VPN running

1. Have Thunderbird configured with the virginmedia account (by the time it worked we had removed the app password from the Thunderbird saved passwords) 2. Select the VirginMedia account INBOX in the left hand window of Thunderbird 3. Click on the download (Get) new message button (cloud with the down arrow, top left of Thunderbird) 4. Thunderbird then says it is connecting to the IMAP server (bottom of mail window), waits a while, then the message disappears and nothing happens. No new messages download, no request for the account password, no error messages, just nothing. 5. On trying to send mail there is no request for the password the system just refuses to connect to the SMTP server.

I had checked a few things on the cmd line and found that the DNS resolution of the virginmedia IMAP server was failing on lookup every time. Below is incorrect: Non-authoritative answer: Name: imap.virginmedia.com Address: 10.100.10.100

With the VPN turned off, the following was the result : Non-authoritative answer: Name: imap-virginmedia-com.edge.unified.services Address: 84.116.6.19 Aliases: imap.virginmedia.com

This is the solution, I found that worked for this instance. But as mentioned I spent significant time search for answer in the settings on Tbird and looking online for ideas. There was nothing that specifically reference this but a couple of ideas lead me to this.

SOLUTION 1. Start Thunderbird, go to the Tools Menu, then Settings and select it 2. In the new tab/window that opens select General on the left hand side, then scroll down to Network and Disk space 3. Click on the Settings button next to Configure how Thunderbird connects to the Internet 4. Scroll down the 'Connection Settings window that opens, to the bottom of the page 5. Tick the box next to Enable DNS over HTTPS (I left the Use Provider set to Custom and the Custom field blank) then Click the OK button. Make sure you click ok, don't just close the window. 6. Then I did a restart of Thunderbird (probably not necessary but just to make sure changes had propagated through the system). 7. Then repeated the download of new messages request with the VirginMedia account, was then prompted for the app password, which I re-entered and marked to save. New messages were then downloaded to the system. 8. Composed a new message and sent it, re-entering the password & marking save it, again (as separate entries in the password table for IMAP & SMTP). New message was sent successfully, copied to the sent folder and received correctly at the destination.

As mentioned, caveats : I don't work for Mozilla, I am a user like you, this worked for this system. I have taken the time to type this out in the hope it helps someone else, as I couldn't find this exact solution on the forums I searched. Thanks

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