diff --git a/Geodatenbezug/Program.cs b/Geodatenbezug/Program.cs
index bb7d761..3c68c76 100644
--- a/Geodatenbezug/Program.cs
+++ b/Geodatenbezug/Program.cs
@@ -23,7 +23,7 @@
             httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", encodedCredentials);
         });
         services.AddTransient<Processor>();
-        services.AddTransient<IMailService>();
+        services.AddTransient<IMailService, MailService>();
         services.AddTransient<IGeodiensteApi, GeodiensteApi>();
         services.AddTransient<IAzureStorage, AzureStorage>();
         services = services.Configure<LoggerFilterOptions>(options =>