Resolver lib on windows

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