public IUsuario LoginValidandoAD(string emailOuLogin, string senha)
        {
            var ADServiceArr = Configuracoes.ADService.Split('§');
            var ADDomainArr = Configuracoes.ADDomain.Split('§');
            var ADUserArr = Configuracoes.ADUser.Split('§');
            var ADPasswordArr = Configuracoes.ADPassword.Split('§');

            var emailDoAd = string.Empty;
            var loginDoAd = string.Empty;
            var estaValidoNoAd = false;

            for (var i = 0; i < ADServiceArr.Length; i++)
            {
                try
                {
                    using (var pc = new PrincipalContext(ContextType.Domain, ADDomainArr[i]))
                    {
                        estaValidoNoAd = pc.ValidateCredentials(emailOuLogin, senha, ContextOptions.Negotiate);

                        Log.Info(string.Format("Esta valido no ad: {0}", estaValidoNoAd));
                    }

                    if (estaValidoNoAd)
                    {
                        var entry = new DirectoryEntry(ADServiceArr[i], string.Concat(ADDomainArr[i], "\\", ADUserArr[i]), ADPasswordArr[i]);

                        var searcher = new DirectorySearcher(entry) { Filter = "(SAMAccountName=" + emailOuLogin + ")" };
                        searcher.PropertiesToLoad.Add("mail");
                        searcher.PropertiesToLoad.Add("samaccountname");

                        Log.Info(string.Format("ADService: {0}, ADDomain: {1}, ADUser: {2}, ADPass: {3}", ADServiceArr[i], ADDomainArr[i], ADUserArr[i], ADPasswordArr[i]));

                        Log.Info("ADSearcherFilter: " + searcher.Filter);
                        Log.Info("ADSearcherPropertiesToLoad: 'mail'");

                        var searchResult = searcher.FindOne();

                        if (searchResult != null)
                        {
                            emailDoAd = searchResult.Properties["mail"].Count > 0 ? searchResult.Properties["mail"][0].ToString() : string.Empty;

                            loginDoAd = searchResult.Properties["samaccountname"].Count > 0 ? searchResult.Properties["samaccountname"][0].ToString() : string.Empty;

                            if (!string.IsNullOrEmpty(emailDoAd) || !string.IsNullOrWhiteSpace(loginDoAd))
                                break;
                        }
                    }

                }
                catch (Exception ex)
                {
                    Log.Info(string.Format("ERRO AO CONECTAR NO SERVIDOR DE AD (server: {0}, domain: {1}, user: {2}, pw: {3}) exception message: {4}", ADServiceArr[i], ADDomainArr[i],
                        ADUserArr[i], ADPasswordArr[i], ex.Message));
                }
            }

            if (!estaValidoNoAd)
                throw new UsuarioInexistenteNoAdException();

            Log.Info("ADSearchResultMail: " + emailDoAd);

            var usuario = Login(emailDoAd) ?? Login(loginDoAd);

            if (usuario == null)
                throw new UsuarioNaoEncontradoException();

            Log.Info("ADUserFromDB: " + (usuario.Nome));

            return usuario;
        }