public NewMailViewModel(IInjectSingleViewService viewService,
     IEmailService emailService)
 {
     this.viewService = viewService;
       this.emailService = emailService;
       email = Email.Create();
       sign = new SecureSigning(key);
 }
 public void OnDecriptCommandExecuted(object arg)
 {
     sign = new SecureSigning(key);
     email.Body = sign.Decrypt(email.Body);
 }