Incase you weren't paying attention to the words this is on the Yggdrasil Mesh network. That means you can't send emails to normal emails outside of the network. You will get a smtp 5.0.0 error this is a mesh network you can only email others connected to Yggdrasil. That's why it's normal that your address looks something like randomletters&numbersalljumbledup@yggmail
it's normal the no .extension at the end I already had some people asking wheres the end of it the .com .org or .net THERE IS NONE!