[WingedDog]

When you you are at the turn sending stage, it doesn't make difference what operating system you are using and what path Dominions are installed. More likely problem caused either:
1) problems with your mail domain;
2) problems with your internet provider;
3) problems with llamaserver.

You could get yourself a new e-mail account on different mail domain and try to send your turn-file from it. Llamaserver doesn't care from which e-mail turn was send.