diff --git a/OpenSim/Region/CoreModules/Avatar/InstantMessage/HGMessageTransferModule.cs b/OpenSim/Region/CoreModules/Avatar/InstantMessage/HGMessageTransferModule.cs
index c51b30fe6e..6f3c80a260 100644
--- a/OpenSim/Region/CoreModules/Avatar/InstantMessage/HGMessageTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/InstantMessage/HGMessageTransferModule.cs
@@ -210,7 +210,7 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
                     success = m_IMService.OutgoingInstantMessage(im, url, foreigner);
 
                 if (!success && !foreigner)
-                    HandleUndeliveredMessage(im, result);
+                    HandleUndeliverableMessage(im, result);
                 else
                     result(success);
             });
@@ -246,7 +246,7 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
             return successful;
         }
 
-        protected void HandleUndeliveredMessage(GridInstantMessage im, MessageResultNotification result)
+        public void HandleUndeliverableMessage(GridInstantMessage im, MessageResultNotification result)
         {
             UndeliveredMessage handlerUndeliveredMessage = OnUndeliveredMessage;
 
diff --git a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
index 40a400f957..7aa7123144 100644
--- a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
@@ -181,7 +181,7 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
             SendGridInstantMessageViaXMLRPC(im, result);
         }
 
-        private void HandleUndeliveredMessage(GridInstantMessage im, MessageResultNotification result)
+        public void HandleUndeliverableMessage(GridInstantMessage im, MessageResultNotification result)
         {
             UndeliveredMessage handlerUndeliveredMessage = OnUndeliveredMessage;
 
@@ -511,14 +511,14 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
                     if (upd.RegionID == prevRegionID)
                     {
                         // m_log.Error("[GRID INSTANT MESSAGE]: Unable to deliver an instant message");
-                        HandleUndeliveredMessage(im, result);
+                        HandleUndeliverableMessage(im, result);
                         return;
                     }
                 }
                 else
                 {
                     // m_log.Error("[GRID INSTANT MESSAGE]: Unable to deliver an instant message");
-                    HandleUndeliveredMessage(im, result);
+                    HandleUndeliverableMessage(im, result);
                     return;
                 }
             }
@@ -567,12 +567,12 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
                 else
                 {
                     m_log.WarnFormat("[GRID INSTANT MESSAGE]: Unable to find region {0}", upd.RegionID);
-                    HandleUndeliveredMessage(im, result);
+                    HandleUndeliverableMessage(im, result);
                 }
             }
             else
             {
-                HandleUndeliveredMessage(im, result);
+                HandleUndeliverableMessage(im, result);
             }
         }
 
diff --git a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
index b0b47a787b..379c769481 100644
--- a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
@@ -37,5 +37,7 @@ namespace OpenSim.Region.Framework.Interfaces
         event UndeliveredMessage OnUndeliveredMessage;
 
         void SendInstantMessage(GridInstantMessage im, MessageResultNotification result);
+
+        void HandleUndeliverableMessage(GridInstantMessage im, MessageResultNotification result);
     }
 }
diff --git a/OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/GroupsMessagingModule.cs b/OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/GroupsMessagingModule.cs
index f8fcd654df..26b70a190f 100644
--- a/OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/GroupsMessagingModule.cs
+++ b/OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/GroupsMessagingModule.cs
@@ -248,6 +248,7 @@ namespace OpenSim.Region.OptionalModules.Avatar.XmlRpcGroups
         {
             List<GroupMembersData> groupMembers = m_groupData.GetGroupMembers(sendingAgentForGroupCalls, groupID);
             int groupMembersCount = groupMembers.Count;
+            HashSet<string> attemptDeliveryUuidSet = null;
 
             if (m_messageOnlineAgentsOnly)
             {
@@ -263,10 +264,12 @@ namespace OpenSim.Region.OptionalModules.Avatar.XmlRpcGroups
                     m_usersOnlineCache.Add(groupID, onlineAgents, m_usersOnlineCacheExpirySeconds);
                 }
 
-                HashSet<string> onlineAgentsUuidSet = new HashSet<string>();
-                Array.ForEach<PresenceInfo>(onlineAgents, pi => onlineAgentsUuidSet.Add(pi.UserID));
+                attemptDeliveryUuidSet 
+                    = new HashSet<string>(Array.ConvertAll<PresenceInfo, string>(onlineAgents, pi => pi.UserID));
 
-                groupMembers = groupMembers.Where(gmd => onlineAgentsUuidSet.Contains(gmd.AgentID.ToString())).ToList();
+                //Array.ForEach<PresenceInfo>(onlineAgents, pi => attemptDeliveryUuidSet.Add(pi.UserID));
+
+                //groupMembers = groupMembers.Where(gmd => onlineAgentsUuidSet.Contains(gmd.AgentID.ToString())).ToList();
 
     //            if (m_debugEnabled)
 //                    m_log.DebugFormat(
@@ -275,6 +278,9 @@ namespace OpenSim.Region.OptionalModules.Avatar.XmlRpcGroups
             }
             else
             {
+                attemptDeliveryUuidSet 
+                    = new HashSet<string>(groupMembers.ConvertAll<string>(gmd => gmd.AgentID.ToString()));
+
                 if (m_debugEnabled)
                     m_log.DebugFormat(
                         "[GROUPS-MESSAGING]: SendMessageToGroup called for group {0} with {1} visible members",
@@ -325,26 +331,33 @@ namespace OpenSim.Region.OptionalModules.Avatar.XmlRpcGroups
 
                 msg.toAgentID = member.AgentID.Guid;
 
-                IClientAPI client = GetActiveClient(member.AgentID);
-                if (client == null)
+                if (attemptDeliveryUuidSet.Contains(member.AgentID.ToString()))
                 {
-                    // If they're not local, forward across the grid
-                    if (m_debugEnabled) m_log.DebugFormat("[GROUPS-MESSAGING]: Delivering to {0} via Grid", member.AgentID);
-                    m_msgTransferModule.SendInstantMessage(msg, delegate(bool success) { });
+                    IClientAPI client = GetActiveClient(member.AgentID);
+                    if (client == null)
+                    {
+                        // If they're not local, forward across the grid
+                        if (m_debugEnabled) m_log.DebugFormat("[GROUPS-MESSAGING]: Delivering to {0} via Grid", member.AgentID);
+                        m_msgTransferModule.SendInstantMessage(msg, delegate(bool success) { });
+                    }
+                    else
+                    {
+                        // Deliver locally, directly
+                        if (m_debugEnabled) m_log.DebugFormat("[GROUPS-MESSAGING]: Passing to ProcessMessageFromGroupSession to deliver to {0} locally", client.Name);
+                        ProcessMessageFromGroupSession(msg, client);
+                    }
                 }
                 else
                 {
-                    // Deliver locally, directly
-                    if (m_debugEnabled) m_log.DebugFormat("[GROUPS-MESSAGING]: Passing to ProcessMessageFromGroupSession to deliver to {0} locally", client.Name);
-                    ProcessMessageFromGroupSession(msg, client);
+                    m_msgTransferModule.HandleUndeliverableMessage(msg, delegate(bool success) { });
                 }
             }
 
             // Temporary for assessing how long it still takes to send messages to large online groups.
             if (m_messageOnlineAgentsOnly)
                 m_log.DebugFormat(
-                    "[GROUPS-MESSAGING]: SendMessageToGroup for group {0} with {1} visible members, {2} online took {3}ms",
-                    groupID, groupMembersCount, groupMembers.Count(), Environment.TickCount - requestStartTick);
+                    "[GROUPS-MESSAGING]: SendMessageToGroup for group {0} with {1} members, {2} candidates for delivery took {3}ms",
+                    groupID, groupMembersCount, attemptDeliveryUuidSet.Count(), Environment.TickCount - requestStartTick);
         }
         
         #region SimGridEventHandlers