diff --git a/infra/mq/mq.c b/infra/mq/mq.c
index a054e19..e17e996 100644
--- a/infra/mq/mq.c
+++ b/infra/mq/mq.c
@@ -132,7 +132,6 @@ int mq_runtime_publish_message_immediate(struct mq_runtime *rt, int topic_id, vo
 	struct mq_message mq_elt;
 	mq_elt.rt=rt;
 	mq_elt.header.topic_id = topic_id;
-	mq_elt.header.priority = STELLAR_MQ_PRIORITY_HIGH;
 	mq_elt.body = msg;
 	mq_dispatch_one_message(topic, &mq_elt);
     if (topic->free_cb)
@@ -150,21 +149,20 @@ void mq_runtime_clean(struct mq_runtime *rt)
 	struct mq_topic *topic;
 	rt->is_cleaning=true;
 
-    for (unsigned long i = 0; i < count_of(rt->priority_mq); i++)
+    for (int i = 0; i < MQ_TYPE_MAX; i++)
     {
-        DL_FOREACH_SAFE(rt->priority_mq[i], mq_elt, tmp)
+        DL_FOREACH_SAFE(rt->mq[i], mq_elt, tmp)
         {
             topic = (struct mq_topic *)utarray_eltptr(rt->schema->topic_array, (unsigned int)(mq_elt->header.topic_id));
             if (topic && topic->free_cb)
             {
                 topic->free_cb(mq_elt->body, topic->free_cb_arg);
             }
-            DL_DELETE(rt->priority_mq[i], mq_elt);
-			rt->priority_mq_len[i]-=1;
+            DL_DELETE(rt->mq[i], mq_elt);
+            rt->mq_len[i] -= 1;
             FREE(mq_elt);
         }
     }
-
     rt->is_cleaning=false;
 }
 
@@ -172,27 +170,19 @@ void mq_runtime_dispatch(struct mq_runtime *rt)
 {
 	struct mq_topic *topic=NULL;
 	struct mq_message *mq_elt=NULL, *mq_tmp=NULL;
-	int cur_priority = STELLAR_MQ_PRIORITY_HIGH;
-	while(cur_priority >= STELLAR_MQ_PRIORITY_LOW)
-	{
-		if(rt->priority_mq[cur_priority]==NULL)
-		{
-			cur_priority--;
-			continue;
-		}
-        DL_FOREACH_SAFE(rt->priority_mq[cur_priority], mq_elt, mq_tmp)
+    while (rt->mq_len[MQ_TYPE_MAILBOX])
+    {
+        DL_FOREACH_SAFE(rt->mq[MQ_TYPE_MAILBOX], mq_elt, mq_tmp)
         {
-			DL_DELETE(rt->priority_mq[mq_elt->header.priority], mq_elt);
-			rt->priority_mq_len[mq_elt->header.priority]-=1;
-			topic = (struct mq_topic *)utarray_eltptr(rt->schema->topic_array,(unsigned int)(mq_elt->header.topic_id));
-			mq_dispatch_one_message(topic, mq_elt);
-    		DL_APPEND(rt->priority_mq[STELLAR_MQ_DEATH_LETTER], mq_elt); // move to dlq list
-			rt->priority_mq_len[STELLAR_MQ_DEATH_LETTER]+=1;
-			cur_priority=STELLAR_MQ_PRIORITY_HIGH;
-			break;
-        }		
-	}
-	//mq_runtime_clean(rt);
+            DL_DELETE(rt->mq[MQ_TYPE_MAILBOX], mq_elt);
+            rt->mq_len[MQ_TYPE_MAILBOX] -= 1;
+            topic = (struct mq_topic *)utarray_eltptr(rt->schema->topic_array, (unsigned int)(mq_elt->header.topic_id));
+            mq_dispatch_one_message(topic, mq_elt);
+            DL_APPEND(rt->mq[MQ_TYPE_DEATH_LETTER], mq_elt); // move to dlq list
+            rt->mq_len[MQ_TYPE_DEATH_LETTER] += 1;
+        }
+    }
+    //mq_runtime_clean(rt);
 	return;
 }
 
@@ -213,11 +203,10 @@ int mq_schema_subscribe(struct mq_schema *s, int topic_id, on_msg_cb_func *on_ms
 	return 0;	
 }
 
-int mq_runtime_publish_message_with_priority(struct mq_runtime *rt, int topic_id, void *data, enum mq_property priority)
+int mq_runtime_publish_message(struct mq_runtime *rt, int topic_id, void *data)
 {
 	if(rt==NULL || rt->schema == NULL)return -1;
 	if(rt->is_cleaning==true)return -1;
-	if(priority < STELLAR_MQ_PRIORITY_LOW || priority > STELLAR_MQ_PRIORITY_HIGH)return -1;
 
 	struct mq_topic *topic = mq_schema_get_topic(rt->schema, topic_id);
 	if(topic==NULL)return -1;
@@ -225,18 +214,12 @@ int mq_runtime_publish_message_with_priority(struct mq_runtime *rt, int topic_id
 	struct mq_message *msg= CALLOC(struct mq_message,1);
 	msg->rt=rt;
 	msg->header.topic_id = topic_id;
-	msg->header.priority = priority;
 	msg->body = data;
-	DL_APPEND(rt->priority_mq[priority], msg);
-	rt->priority_mq_len[priority]+=1;
+	DL_APPEND(rt->mq[MQ_TYPE_MAILBOX], msg);
+	rt->mq_len[MQ_TYPE_MAILBOX]+=1;
 	return 0;	
 }
 
-int mq_runtime_publish_message(struct mq_runtime *rt, int topic_id, void *data)
-{
-	return mq_runtime_publish_message_with_priority(rt, topic_id, data, STELLAR_MQ_PRIORITY_MEDIUM);
-}
-
 struct mq_schema *mq_schema_new()
 {
 	struct mq_schema *s = CALLOC(struct mq_schema,1);
diff --git a/infra/mq/mq_internal.h b/infra/mq/mq_internal.h
index 146d222..342c79b 100644
--- a/infra/mq/mq_internal.h
+++ b/infra/mq/mq_internal.h
@@ -10,22 +10,12 @@ extern "C"
 
 #include <stdbool.h>
 
-enum mq_property
-{
-	STELLAR_MQ_DEATH_LETTER = 0,
-	STELLAR_MQ_PRIORITY_LOW = 1,
-	STELLAR_MQ_PRIORITY_MEDIUM,
-	STELLAR_MQ_PRIORITY_HIGH,
-	STELLAR_MQ_MAX
-};
-
 struct mq_message
 {
 	struct mq_runtime *rt;
     struct
     {
         int topic_id;
-		enum mq_property priority;
     } header;
     void *body;
     struct mq_message *next, *prev;
@@ -62,15 +52,21 @@ struct mq_schema
 };
 
 
+enum mq_property
+{
+	MQ_TYPE_MAILBOX	= 0,
+	MQ_TYPE_DEATH_LETTER = 1,
+	MQ_TYPE_MAX,
+};
+
 struct mq_runtime
 {
 	struct mq_schema *schema;
-	struct mq_message *priority_mq[STELLAR_MQ_MAX];// message list
-	size_t priority_mq_len[STELLAR_MQ_MAX];
+	struct mq_message *mq[MQ_TYPE_MAX];// message queue
+	size_t mq_len[MQ_TYPE_MAX];
 	bool is_cleaning;
 };
 
-int mq_runtime_publish_message_with_priority(struct mq_runtime *rt, int topic_id, void *msg, enum mq_property priority);
 int mq_runtime_publish_message_immediate(struct mq_runtime *rt, int topic_id, void *msg);
 
 #ifdef __cplusplus
diff --git a/infra/mq/test/gtest_mq_main.cpp b/infra/mq/test/gtest_mq_main.cpp
index a2ee952..06050b2 100644
--- a/infra/mq/test/gtest_mq_main.cpp
+++ b/infra/mq/test/gtest_mq_main.cpp
@@ -304,7 +304,7 @@ TEST(mq_runtime, basic_pub_sub) {
 	EXPECT_TRUE(rt!=NULL);
 	env.rt=rt;
 
-	int N_packet=10;
+	int N_packet=1;
     for (int i = 0; i < N_packet; i++)
     {
         mq_runtime_publish_message(rt, packet_in_topic_id, &pkt);
@@ -537,6 +537,7 @@ TEST(mq_runtime, sub_with_dispatch_cb) {
 	EXPECT_EQ(env.sess_msg_free_called, env.N_session);
 }
 
+#if 0
 struct test_priority_mq_env
 {
 	struct mq_schema *s;
@@ -671,7 +672,7 @@ TEST(mq_runtime, basic_mq_priority) {
 	EXPECT_EQ(env.plugin_id_1_called,env.N_round*3);
 	EXPECT_EQ(env.plugin_id_2_called,env.N_round*3);
 }
-
+#endif
 
 struct test_polling_module
 {