diff --git a/OpenSim/Services/Connectors/InstantMessage/InstantMessageServiceConnector.cs b/OpenSim/Services/Connectors/InstantMessage/InstantMessageServiceConnector.cs
index e19c23dfdf..c1f23afce4 100644
--- a/OpenSim/Services/Connectors/InstantMessage/InstantMessageServiceConnector.cs
+++ b/OpenSim/Services/Connectors/InstantMessage/InstantMessageServiceConnector.cs
@@ -50,9 +50,9 @@ namespace OpenSim.Services.Connectors.InstantMessage
         /// <param name="url">URL we pull the data out of to send the request to</param>
         /// <param name="im">The Instant Message </param>
         /// <returns>Bool if the message was successfully delivered at the other side.</returns>
-        public static bool SendInstantMessage(string url, GridInstantMessage im)
+        public static bool SendInstantMessage(string url, GridInstantMessage im, string messageKey)
         {
-            Hashtable xmlrpcdata = ConvertGridInstantMessageToXMLRPC(im);
+            Hashtable xmlrpcdata = ConvertGridInstantMessageToXMLRPC(im, messageKey);
             xmlrpcdata["region_handle"] = 0;
 
             ArrayList SendParams = new ArrayList();
@@ -97,7 +97,7 @@ namespace OpenSim.Services.Connectors.InstantMessage
         /// </summary>
         /// <param name="msg">The GridInstantMessage object</param>
         /// <returns>Hashtable containing the XMLRPC request</returns>
-        protected static Hashtable ConvertGridInstantMessageToXMLRPC(GridInstantMessage msg)
+        protected static Hashtable ConvertGridInstantMessageToXMLRPC(GridInstantMessage msg, string messageKey)
         {
             Hashtable gim = new Hashtable();
             gim["from_agent_id"] = msg.fromAgentID.ToString();
@@ -125,6 +125,9 @@ namespace OpenSim.Services.Connectors.InstantMessage
             gim["binary_bucket"] = Convert.ToBase64String(msg.binaryBucket, Base64FormattingOptions.None);
             gim["region_id"] = new UUID(msg.RegionID).ToString();
 
+            if (messageKey != String.Empty)
+                gim["message_key"] = messageKey;
+
             return gim;
         }
 
diff --git a/OpenSim/Services/HypergridService/HGInstantMessageService.cs b/OpenSim/Services/HypergridService/HGInstantMessageService.cs
index d1739cfc11..09c5354467 100644
--- a/OpenSim/Services/HypergridService/HGInstantMessageService.cs
+++ b/OpenSim/Services/HypergridService/HGInstantMessageService.cs
@@ -118,6 +118,7 @@ namespace OpenSim.Services.HypergridService
                     return;
                 }
 
+                m_messageKey = cnf.GetString("MessageKey", String.Empty);
                 m_ForwardOfflineGroupMessages = cnf.GetBoolean("ForwardOfflineGroupMessages", false);
 
                 if (m_InGatekeeper)
@@ -282,7 +283,7 @@ namespace OpenSim.Services.HypergridService
 
             if (reginfo != null)
             {
-                imresult = InstantMessageServiceConnector.SendInstantMessage(reginfo.ServerURI, im);
+                imresult = InstantMessageServiceConnector.SendInstantMessage(reginfo.ServerURI, im, m_messageKey);
             }
             else
             {
@@ -373,4 +374,4 @@ namespace OpenSim.Services.HypergridService
             return m_OfflineIMService.StoreMessage(im, out reason);
         }
     }
-}
\ No newline at end of file
+}