diff --git a/broker/config/wildfirechat.conf b/broker/config/wildfirechat.conf
index a6d11e67..36f128c3 100755
--- a/broker/config/wildfirechat.conf
+++ b/broker/config/wildfirechat.conf
@@ -170,6 +170,10 @@ robot.callback_with_sender_info false
 ## 机器人回调信息是否带上目标的信息，单聊时是对方用户信息，群聊时是群组信息，频道时是频道信息
 robot.callback_with_target_info false
 
+## 是否允许@会话外的机器人。如果为true，单聊或者群聊时，可以@不在会话中的机器人。当机器人收到消息后，可以回复消息。
+## 如果为false，不能@不在会话中的机器人。机器人不在会话中时，也不能回复消息。
+robot.mention_external_robot true
+
 ## 频道回调信息是否带上用户clientId和平台类型。
 channel.callback_with_client_info false
 
diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/ReplyMessageAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/ReplyMessageAction.java
index a6ff64bb..f604b0f1 100755
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/ReplyMessageAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/ReplyMessageAction.java
@@ -55,6 +55,15 @@ public class ReplyMessageAction extends RobotAction {
                     errorCode = ErrorCode.ERROR_CODE_NOT_IMPLEMENT;
                 } else if(System.currentTimeMillis() - message.getServerTimestamp() > 15*60*1000) {
                     errorCode = ErrorCode.ERROR_CODE_RECALL_TIME_EXPIRED;
+                } else if(!messagesStore.isRobotMentionExternalRobot()) {
+                    if(message.getConversation().getType() != ProtoConstants.ConversationType.ConversationType_Group) {
+                        errorCode = ErrorCode.ERROR_CODE_NOT_IMPLEMENT;
+                    } else {
+                        WFCMessage.GroupMember member = messagesStore.getGroupMember(message.getConversation().getTarget(), robot.getUid());
+                        if(member == null || member.getType() == ProtoConstants.GroupMemberType.GroupMemberType_Removed) {
+                            errorCode = ErrorCode.ERROR_CODE_NOT_IMPLEMENT;
+                        }
+                    }
                 }
 
                 if(errorCode != null) {
diff --git a/broker/src/main/java/io/moquette/BrokerConstants.java b/broker/src/main/java/io/moquette/BrokerConstants.java
index 853472c7..791b274d 100755
--- a/broker/src/main/java/io/moquette/BrokerConstants.java
+++ b/broker/src/main/java/io/moquette/BrokerConstants.java
@@ -173,6 +173,8 @@ public final class BrokerConstants {
     public static final String ROBOT_Callback_With_Client_Info = "robot.callback_with_client_info";
     public static final String ROBOT_Callback_With_Sender_Info = "robot.callback_with_sender_info";
     public static final String ROBOT_Callback_With_Target_Info = "robot.callback_with_target_info";
+    public static final String ROBOT_Mention_External_Robot = "robot.mention_external_robot";
+
 
     public static final String CHANNEL_Callback_With_Client_Info = "channel.callback_with_client_info";
     public static final String CHANNEL_Callback_With_Sender_Info = "channel.callback_with_sender_info";
diff --git a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
index 47ce864f..78539005 100755
--- a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
@@ -213,6 +213,7 @@ public class MemoryMessagesStore implements IMessagesStore {
     private boolean mRobotCallbackWithClientInfo = false;
     private boolean mRobotCallbackWithSenderInfo = false;
     private boolean mRobotCallbackWithTargetInfo = false;
+    private boolean mRobotMentionExternalRobot = false;
 
     private boolean mChannelCallbackWithClientInfo = false;
     private boolean mChannelCallbackWithSenderInfo = false;
@@ -646,6 +647,9 @@ public class MemoryMessagesStore implements IMessagesStore {
         try {
             mRobotCallbackWithTargetInfo = Boolean.parseBoolean(server.getConfig().getProperty(BrokerConstants.ROBOT_Callback_With_Target_Info, "false"));
         } catch (Exception e) {}
+        try {
+            mRobotMentionExternalRobot = Boolean.parseBoolean(server.getConfig().getProperty(BrokerConstants.ROBOT_Mention_External_Robot, "false"));
+        } catch (Exception e) {}
 
         try {
             mChannelCallbackWithClientInfo = Boolean.parseBoolean(server.getConfig().getProperty(BrokerConstants.CHANNEL_Callback_With_Client_Info, "false"));
@@ -741,7 +745,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         int type = message.getConversation().getType();
         int pullType = ProtoConstants.PullType.Pull_Normal;
 
-        if (type == ProtoConstants.ConversationType.ConversationType_Private) {
+        if (mRobotMentionExternalRobot && type == ProtoConstants.ConversationType.ConversationType_Private) {
             if(message.getConversation().getTarget().contains("|")) {
                 String[] ss = message.getConversation().getTarget().split("\\|");
                 notifyReceivers.add(ss[0]);
@@ -761,7 +765,7 @@ public class MemoryMessagesStore implements IMessagesStore {
                     notifyReceivers.add(message.getConversation().getTarget());
                 }
             }
-            if (message.getContent().getMentionedTargetCount() > 0) {
+            if (mRobotMentionExternalRobot && message.getContent().getMentionedTargetCount() > 0) {
                 for (String mentioned : message.getContent().getMentionedTargetList()) {
                     if (!notifyReceivers.contains(mentioned)) {
                         WFCMessage.User user = getUserInfo(mentioned);
@@ -799,7 +803,7 @@ public class MemoryMessagesStore implements IMessagesStore {
                     }
                 }
             }
-            if (message.getContent().getMentionedTargetCount() > 0) {
+            if (mRobotMentionExternalRobot && message.getContent().getMentionedTargetCount() > 0) {
                 for (String mentioned : message.getContent().getMentionedTargetList()) {
                     if (!notifyReceivers.contains(mentioned)) {
                         WFCMessage.User user = getUserInfo(mentioned);
@@ -4922,6 +4926,11 @@ public class MemoryMessagesStore implements IMessagesStore {
         return mRobotCallbackWithTargetInfo;
     }
 
+    @Override
+    public boolean isRobotMentionExternalRobot() {
+        return mRobotMentionExternalRobot;
+    }
+
     @Override
     public boolean isChannelCallbackWithClientInfo() {
         return mChannelCallbackWithClientInfo;
diff --git a/broker/src/main/java/io/moquette/spi/IMessagesStore.java b/broker/src/main/java/io/moquette/spi/IMessagesStore.java
index 5af7270f..4ad51f07 100755
--- a/broker/src/main/java/io/moquette/spi/IMessagesStore.java
+++ b/broker/src/main/java/io/moquette/spi/IMessagesStore.java
@@ -254,6 +254,7 @@ public interface IMessagesStore {
     boolean isRobotCallbackWithClientInfo();
     boolean isRobotCallbackWithSenderInfo();
     boolean isRobotCallbackWithTargetInfo();
+    boolean isRobotMentionExternalRobot();
 
     boolean isChannelCallbackWithClientInfo();
     boolean isChannelCallbackWithSenderInfo();
diff --git a/distribution/src/main/resources/wildfirechat.conf b/distribution/src/main/resources/wildfirechat.conf
index e5e7e919..fe91b7f8 100755
--- a/distribution/src/main/resources/wildfirechat.conf
+++ b/distribution/src/main/resources/wildfirechat.conf
@@ -167,6 +167,10 @@ robot.callback_with_sender_info false
 ## 机器人回调信息是否带上目标的信息，单聊时是对方用户信息，群聊时是群组信息，频道时是频道信息
 robot.callback_with_target_info false
 
+## 是否允许@会话外的机器人。如果为true，单聊或者群聊时，可以@不在会话中的机器人。当机器人收到消息后，可以回复消息。
+## 如果为false，不能@不在会话中的机器人。机器人不在会话中时，也不能回复消息。
+robot.mention_external_robot true
+
 ## 频道回调信息是否带上用户clientId和平台类型。
 channel.callback_with_client_info false