diff --git a/.gitignore b/.gitignore
index 2f72fc4..4b4d266 100644
--- a/.gitignore
+++ b/.gitignore
@@ -154,3 +154,4 @@ $RECYCLE.BIN/
 
 # Mac desktop service store files
 .DS_Store
+.vs/
diff --git a/Log4Slack/SlackAppender.cs b/Log4Slack/SlackAppender.cs
index bfef684..da4f44e 100644
--- a/Log4Slack/SlackAppender.cs
+++ b/Log4Slack/SlackAppender.cs
@@ -20,6 +20,8 @@ public class SlackAppender : AppenderSkeleton {
         private readonly Process _currentProcess = Process.GetCurrentProcess();
         private List<Mapping> Mappings = new List<Mapping>();
 
+        public static List<Type> ExceptionTypesToIgnore = new List<Type>();
+
         /// <summary>
         /// Slack token.
         /// https://api.slack.com/
@@ -79,7 +81,12 @@ public class SlackAppender : AppenderSkeleton {
 
         public Mapping mapping { set { Mappings.Add(value); } }
 
-        protected override void Append(log4net.Core.LoggingEvent loggingEvent) {
+        protected override void Append(log4net.Core.LoggingEvent loggingEvent)
+        {
+
+            if (ExceptionTypesToIgnore.Contains(loggingEvent.ExceptionObject.GetType()))
+                return;
+            
             // Initialze the Slack client
             var slackClient = new SlackClient(WebhookUrl.Expand());
             var attachments = new List<Attachment>();
@@ -140,6 +147,16 @@ protected override void Append(log4net.Core.LoggingEvent loggingEvent) {
         }
     }
 
+
+    public static class PublicExtensions
+    {
+        public static void Add<T>(this List<Type> list)
+        {
+            list.Add(typeof(T));
+        }
+    }
+
+
     internal static class Extensions {
         public static string Expand(this string text) {
             return text != null ? Environment.ExpandEnvironmentVariables(text) : null;
diff --git a/Log4SlackTesting/Program.cs b/Log4SlackTesting/Program.cs
index 3fe5e18..923dc26 100644
--- a/Log4SlackTesting/Program.cs
+++ b/Log4SlackTesting/Program.cs
@@ -4,11 +4,19 @@
 using System.Text;
 using System.Threading.Tasks;
 using log4net;
+using Log4Slack;
 
 namespace Log4SlackTesting {
     class Program {
         static void Main(string[] args) {
             log4net.Config.XmlConfigurator.Configure();
+
+            // Add exception to ignore
+            SlackAppender.ExceptionTypesToIgnore.Add(typeof(UnauthorizedAccessException));
+
+            // Or add exception to ignore using extension
+            SlackAppender.ExceptionTypesToIgnore.Add<InvalidCastException>();
+
             var logger = LogManager.GetLogger(typeof(Program));
             logger.Info("I know he can get the job, but can he do the job?");
             logger.Debug("I'm not arguing that with you.");
@@ -23,7 +31,11 @@ static void Main(string[] args) {
 
             logger.Fatal("That's it. It's over.", new EncoderFallbackException("Could not fall backwards."));
 
+            logger.Error("This should be ignored.", new UnauthorizedAccessException("No."));
+            logger.Error("This as well.", new InvalidCastException("No."));
+
             Console.ReadKey();
         }
     }
 }
+