diff --git a/DakotaSender/App.config b/DakotaSender/App.config
index 9d9b5098f..7abd3f046 100644
--- a/DakotaSender/App.config
+++ b/DakotaSender/App.config
@@ -4,6 +4,8 @@
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
     </startup>
 	<appSettings>
+    <add key="TenantsAllowTxtPath" value="C:\GkvAbrechnung\Sender\tenants_allow.txt" />
+    <add key="TenantsTestTxtPath" value="C:\GkvAbrechnung\Sender\tenants_test.txt" />
     <add key="GkvAbrechnungResultFolderPath" value="C:\GkvAbrechnung\Results\" />
     <add key="GkvAbrechnungQueueFolderPath" value="C:\GkvAbrechnung\Data\Queue\" />
     <add key="GkvAbrechnungCopyFolderPath" value="C:\GkvAbrechnung\Data\QueueCopy\" />
@@ -12,12 +14,12 @@
     <add key="GkvAbrechnungCopySave" value="True" />
     <add key="GkvAbrechnungFailedSave" value="True" />
     <add key="GkvAbrechnungSuccessSave" value="True" />
-		<add key="DakotaExePath" value="C:\Program Files (x86)\ITSG\dakotale\dakota30.exe" />
-		<add key="DakotaFolder" value="C:\dakotale\" />
-		<add key="ProcessWaitForExitMs" value="10000" />
-		<add key="LogPath" value="C:\GkvAbrechnung\Sender\log.txt" />
-		<add key="LogFileName" value="logs.txt" />
-		<add key="LogSingleFile" value="True" />
+    <add key="DakotaExePath" value="C:\Program Files (x86)\ITSG\dakotale\dakota30.exe" />
+    <add key="DakotaFolder" value="C:\dakotale\" />
+    <add key="ProcessWaitForExitMs" value="10000" />
+    <add key="LogPath" value="C:\GkvAbrechnung\Sender\log.txt" />
+    <add key="LogFileName" value="logs.txt" />
+    <add key="LogSingleFile" value="True" />
     <add key="GkvSecretKey" value="DfDGNGn72PKfSYxSUsmRdzuBtpR9novewlmYU3gsjiFgSkaZZeylUXlbO42cWNqiKgLdMUFtWUNZT962F1raQDR7HGUzCNYsFeC" />
     <add key="SendMailModuleSmtpServer" value="mail.ownsoft.de" />
     <add key="SendMailModuleGkvEnabled" value="true" />
diff --git a/DakotaSender/Config.cs b/DakotaSender/Config.cs
index d3db362a3..244d9b635 100644
--- a/DakotaSender/Config.cs
+++ b/DakotaSender/Config.cs
@@ -10,6 +10,12 @@ namespace DakotaSender
 {
 	internal static class Config
 	{
+		public static string TenantsAllowTxtPath { get; }
+			= ConfigurationManager.AppSettings.Get("TenantsAllowTxtPath") ?? @"C:\GkvAbrechnung\Sender\tenants_allow.txt";
+
+		public static string TenantsTestTxtPath { get; }
+			= ConfigurationManager.AppSettings.Get("TenantsTestTxtPath") ?? @"C:\GkvAbrechnung\Sender\tenants_test.txt";
+
 		public static DirectoryInfo ResultFolder { get; }
 			= new DirectoryInfo(ConfigurationManager.AppSettings.Get("GkvAbrechnungResultFolderPath") ?? @"C:\GkvAbrechnung\Results\");
 
diff --git a/DakotaSender/DakotaSender.csproj b/DakotaSender/DakotaSender.csproj
index 67c1688ef..8c7471ffc 100644
--- a/DakotaSender/DakotaSender.csproj
+++ b/DakotaSender/DakotaSender.csproj
@@ -45,6 +45,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Config.cs" />
+    <Compile Include="DakotaSenderUtils.cs" />
     <Compile Include="FileController.cs" />
     <Compile Include="Returncodes.cs" />
     <Compile Include="DakotaSystemFile.cs" />
@@ -61,5 +62,9 @@
       <Name>Shared</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="tenants_allows.txt" />
+    <Content Include="tenants_test.txt" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
diff --git a/DakotaSender/DakotaSenderUtils.cs b/DakotaSender/DakotaSenderUtils.cs
new file mode 100644
index 000000000..17183b64c
--- /dev/null
+++ b/DakotaSender/DakotaSenderUtils.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DakotaSender
+{
+	internal static class DakotaSenderUtils
+	{
+		public static bool IsTenantAllowed(string tenant)
+		{
+			var list = FileController.GetTenantsAllowedList();
+
+			return list.Contains(tenant);
+		}
+		
+		public static bool IsTenantTest(string tenant)
+		{
+			var list = FileController.GetTenantsTestList();
+
+			return list.Contains(tenant);
+		}
+	}
+}
diff --git a/DakotaSender/DakotaSystemFile.cs b/DakotaSender/DakotaSystemFile.cs
index b24cea9ef..389d87709 100644
--- a/DakotaSender/DakotaSystemFile.cs
+++ b/DakotaSender/DakotaSystemFile.cs
@@ -9,6 +9,8 @@ namespace DakotaSender
 {
     internal class DakotaSystemFile
     {
+        public bool TestCase { get; set; }
+
         public string Tenant { get; set; }
         public long ProtokollOid { get; set; }
         public long ApplicationUserOid { get; set; }
diff --git a/DakotaSender/FileController.cs b/DakotaSender/FileController.cs
index 319d5cab2..38bb8aa7d 100644
--- a/DakotaSender/FileController.cs
+++ b/DakotaSender/FileController.cs
@@ -56,7 +56,7 @@ namespace DakotaSender
 		}
 		internal static void CopyFile(string source, string destination)
 		{
-			Program.Print($"Kopiere \"{source}\" nach \"{destination}\". ");
+			Program.Print($"- Kopiere \"{source}\" nach \"{destination}\". ");
 
 			File.Copy(source, destination);
 
@@ -77,7 +77,7 @@ namespace DakotaSender
 		}
 		internal static void DeleteFile(string file)
 		{
-			Program.Print($"Lösche {file}. ");
+			Program.Print($"- Lösche {file}. ");
 
 			File.Delete(file);
 
@@ -99,5 +99,18 @@ namespace DakotaSender
 
 			Program.PrintLine("Ok.");
 		}
+
+		internal static IEnumerable<string> GetTenantsAllowedList()
+		{
+			var path = Config.TenantsAllowTxtPath;
+
+			return File.ReadAllLines(path);
+		}
+		internal static IEnumerable<string> GetTenantsTestList()
+		{
+			var path = Config.TenantsTestTxtPath;
+
+			return File.ReadAllLines(path);
+		}
 	}
 }
diff --git a/DakotaSender/Program.cs b/DakotaSender/Program.cs
index 3219c10c7..38a8914c4 100644
--- a/DakotaSender/Program.cs
+++ b/DakotaSender/Program.cs
@@ -195,16 +195,18 @@ namespace DakotaSender
 				var datenannahmestelle = split[3];
 				var transfername = split[4];
 
-				// Muss nachher nur entfernt werden, um andere zu testen
-				// Ggf Tool einbauen?
-				if (tenant != TEST_TENANT && tenant != TEST_TENANT_2)
+				var test = DakotaSenderUtils.IsTenantTest(tenant);
+				var allow = DakotaSenderUtils.IsTenantAllowed(tenant);
+
+				if(!test && !allow)
 				{
-					PrintLine($"{auft.FullName} wird ignoriert. Tenant {tenant} nicht gültig.");
+					PrintLine($"{auft.FullName} wird ignoriert. Tenant \'{tenant}\' ungültig.");
 					return null;
 				}
 
 				var file = new DakotaSystemFile()
 				{
+					TestCase = test,
 					SourceAuftragsdatei = auft,
 					SourceNutzdatendatei = nutz,
 					Tenant = tenant,
@@ -318,8 +320,14 @@ namespace DakotaSender
 
 			PrintFileInfo(file);
 
+			if (file.TestCase)
+			{
+				success = true;
+				return "- TestCase. ";
+			}
+
 			if (!Config.IsDatenannahmestelleValid(file.Datenannahmestelle))
-				return $"Datenannahmestelle {file.Datenannahmestelle} unbekannt.";
+				return $"- Datenannahmestelle {file.Datenannahmestelle} unbekannt.";
 
 			FileController.CopyFileToDestination(file);
 
@@ -339,7 +347,10 @@ namespace DakotaSender
 				throw new Exception();
 			}
 
-			return message;
+			if (success)
+				return "Ok.";
+			else
+				return message;
 		}
 		static void Add2Results(DakotaSystemFile file, GkvTransferResultType type, string nachricht = null, string title = null)
 		{
diff --git a/DakotaSender/tenants_allows.txt b/DakotaSender/tenants_allows.txt
new file mode 100644
index 000000000..5f282702b
--- /dev/null
+++ b/DakotaSender/tenants_allows.txt
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/DakotaSender/tenants_test.txt b/DakotaSender/tenants_test.txt
new file mode 100644
index 000000000..5f282702b
--- /dev/null
+++ b/DakotaSender/tenants_test.txt
@@ -0,0 +1 @@
+
\ No newline at end of file