Thunderbird Community Forum

My Thunderbird app has been working correctly for months since I installed it. I use Dream Host as my email provider, my email address is [email protected], and I am running on Win 10.

Starting yesterday, it refused to send or receive any of my emails. It provided the following error message: "The certificate for mail.bdmdata.com is not valid for that server..."

I also received the following message when I open Thunderbird. "You have received 3 new messages..." But no new email messages show up in my inbox.

How can I fix this and get back to work.

Hi,

Thunderbird tries to access many websites, even when it is in the background and apparently idle. In the last two or three weeks, it has tried to access about sixty websites that Little Snitch (Macintosh) reports by IP address, not domain name. Without knowing the domain name, I cannot tell what Thunderbird is trying to do, so I do not allow it to access those sites.

I know that Firefox does this also and that Thunderbird is built on Firefox.

In the Mullvad browser, built on Tor's browser, which is, in turn, built on Firefox, this problem is resolved by setting an option to use the user's default DNS resolver. I cannot find such an option in Thunderbird. Might there be one in a configuration setting? Or some other way to deal with this matter?

Thanks for any help.

Rick

I use Microsoft Outlook for Windows from time to time and discovered it is possible to sign/encrypt emails with an S/MIME certificate even if the email on the certificate does not match the "From" email address. Although this is disabled by default, it can be enabled by following these steps: https://learn.microsoft.com/en-us/previous-versions/troubleshoot/outlook/how-to-turn-off-email-matching-for-certificates

I wonder if there is an equivalent mechanism for S/MIME and/or OpenPGP certificates imported into Thunderbird, whether by changing settings in the config editor or otherwise?