diff --git a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
index 38d2d21b42..b8e0c295d2 100644
--- a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
@@ -48,6 +48,10 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
         private List<Scene> m_Scenes = new List<Scene>();
         private Dictionary<UUID, ulong> m_UserRegionMap = new Dictionary<UUID, ulong>();
 
+        public event ExternalHandleIM OnExternalIMCapture;
+
+        private ExternalHandleIM handlerExternalIMCapture;
+
         public void Initialise(Scene scene, IConfigSource config)
         {
             IConfig cnf = config.Configs["Messaging"];
@@ -95,6 +99,16 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
 
         public void SendInstantMessage(GridInstantMessage im, MessageResultNotification result)
         {
+            handlerExternalIMCapture = OnExternalIMCapture;
+            if (handlerExternalIMCapture != null)
+            {
+                if (handlerExternalIMCapture(im))
+                {
+                    result(true);
+                    return;
+                }
+            }
+
             UUID toAgentID = new UUID(im.toAgentID);
 
             m_log.DebugFormat("[INSTANT MESSAGE]: Attempting delivery of IM from {0} to {1}", im.fromAgentName, toAgentID.ToString());
diff --git a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
index ffae307809..bc194b92ac 100644
--- a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
@@ -30,9 +30,12 @@ using OpenSim.Framework;
 namespace OpenSim.Region.Framework.Interfaces
 {
     public delegate void MessageResultNotification(bool success);
+    public delegate bool ExternalHandleIM(GridInstantMessage im);
 
     public interface IMessageTransferModule
     {
+        event ExternalHandleIM OnExternalIMCapture;
+
         void SendInstantMessage(GridInstantMessage im, MessageResultNotification result);
     }
 }