Hi,
The networking code in gecko uses the operating system's APIs to resolve
domains.
So if there is something wrong with the Windows DNS configuration, it will
also fail in Firefox/Thunderbird.
Thanks!
On Wed, 3 Feb 2021 at 10:09, basti <
[hidden email]> wrote:
> Hello,
>
> That is the way that Thunderbird is using to resolve hostnames on
> windows (default settings, no DNS over https)
>
> Is it use the windows libery or a own one?
>
> The Problem is that I have 2 DNS servers configured in windows,
> If the first in the list is down, for some reason Thunderbird can't find
> the mailserver anymore.
>
> Ping mailserver work as expected.
>
> best regards
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