Phoenix.new AI bot problems - getting “message failed to send”

So I tried out the new bot platform of Chris. I am still working on the first page/application. I’ve let it create the user registration, i18n translations and stuff.. but more and more often, I get the error “message railed to send”. Right now, I have no idea what the current state of the system would be. And this while having already paid about 40$ - there is no “help” link or anything to contact someone while having trouble. I had to figure out Chris’ mail by looking at TwiXXer… anyone know where to get official support?