'awokd' via qubes-users:
> taran1s:
>> Hi, I am stuck with the following Thunderbird issue.
>>
>> I created new anon-whonix AppVM where I would like to have my new email
>> account in Thunderbord, but whatever I do, I get "Could not connect to
>> server xxx connection was refused" immediately after clicking the Get
>> Messages. At the same time, TB can nicely connect to the network from
>> that AppVM.
>>
>> Thunderbird in older anon-whonix AppVMs are connecting just ok. The
>> settings are precisely the same in both - the old and new anon-whonix.
>> The template is the same whonix-ws-15.
>>
>> I tried to create anon-whonix through salt or directly from the Qube
>> Manager with Create a new qube, but still the same issue.
>>
>> Any idea how to solve this?
>
> From your new anon-whonix AppVM, test using a different app like regular
> Firefox and see if it can connect to the Internet. Also, verify its
> NetVM is set to sys-whonix.
>
As I mention, TB in the anon-whonix AppVM is able to connect to the
internet, except Thunderbird. All email account settings are ok. The
same settings are working in the old anon-whonix AppVM just well.