diff --git a/etc/emqttd.conf.3 b/etc/emqttd.conf.3
deleted file mode 100644
index 95d0800ca..000000000
--- a/etc/emqttd.conf.3
+++ /dev/null
@@ -1,179 +0,0 @@
-##===================================================================
-##
-## Config file for EMQ 3.0
-##
-##===================================================================
-
-##--------------------------------------------------------------------
-## Authentication
-##--------------------------------------------------------------------
-
-%% Anonymous: Allow all
-{auth, anonymous, []}.
-
-%% Authentication with username, password
-{auth, username, [{passwd, "etc/modules/passwd.conf"}]}.
-
-%% Authentication with clientId
-{auth, clientid, [{config, "etc/modules/client.conf"}, {password, no}]}.
-
-%%--------------------------------------------------------------------
-%% ACL
-%%--------------------------------------------------------------------
-
-{acl, anonymous, []}.
-
-{acl, internal, [{config, "etc/modules/acl.conf"}, {nomatch, allow}]}.
-
-%% Cache ACL result for PUBLISH
-{cache_acl, true}.
-
-%%--------------------------------------------------------------------
-%% Listener
-%%--------------------------------------------------------------------
-
-%% Plain MQTT
-{listener, mqtt, 1883, [
-    %% Size of acceptor pool
-    {acceptors, 16},
-
-    %% Maximum number of concurrent clients
-    {max_clients, 512},
-
-    %% Mount point prefix
-    %% {mount_point, "prefix/"},
-
-    %% Socket Access Control
-    {access, [{allow, all}]},
-
-    %% Connection Options
-    {connopts, [
-        %% Rate Limit. Format is 'burst, rate', Unit is KB/Sec
-        %% {rate_limit, "100,10"} %% 100K burst, 10K rate
-    ]},
-
-    %% Socket Options
-    {sockopts, [
-        %Set buffer if hight thoughtput
-        %{recbuf, 4096},
-        %{sndbuf, 4096},
-        %{buffer, 4096},
-        %{nodelay, true},
-        {backlog, 1024}
-    ]}
-]}.
-
-%% MQTT/SSL
-{listener, mqtts, 8883, [
-    %% Size of acceptor pool
-    {acceptors, 4},
-
-    %% Maximum number of concurrent clients
-    {max_clients, 512},
-
-    %% Mount point prefix
-    %% {mount_point, "secure/"},
-
-    %% Socket Access Control
-    {access, [{allow, all}]},
-
-    %% SSL certificate and key files
-    {ssl, [{handshake_timeout, 10000},
-           %% Mutual SSL Authentication option
-           %% {verify, verify_peer},
-           %% {cacertfile, "etc/ssl/ca.pem"},
-           {certfile, "etc/ssl/ssl.crt"},
-           {keyfile,  "etc/ssl/ssl.key"}]},
-
-    %% Socket Options
-    {sockopts, [
-        {backlog, 1024}
-        %{buffer, 4096},
-    ]}
-]}.
-
-%% HTTP and WebSocket Listener
-{listener, http, 8083, [
-    %% Size of acceptor pool
-    {acceptors, 4},
-
-    %% Maximum number of concurrent clients
-    {max_clients, 64},
-
-    %% Socket Access Control
-    {access, [{allow, all}]},
-
-    %% Socket Options
-    {sockopts, [
-        {backlog, 1024}
-        %{buffer, 4096},
-    ]}
-]}.
-
-%%--------------------------------------------------------------------
-%% PubSub
-%%--------------------------------------------------------------------
-
-%% PubSub Pool Size. Default should be scheduler numbers.
-{pubsub_pool_size, 8}.
-
-{pubsub_by_clientid, true}.
-
-%% Subscribe Asynchronously
-{pubsub_async, true}.
-
-%%--------------------------------------------------------------------
-%% Bridge
-%%--------------------------------------------------------------------
-
-%% TODO: Bridge Queue Size
-{bridge_max_queue_len, 10000}.
-
-%% Ping Interval of bridge node
-{bridge_ping_down_interval, 1}. % second
-
-%%-------------------------------------------------------------------
-%% Plugins
-%%-------------------------------------------------------------------
-
-%% Dir of plugins' config
-{plugins_etc_dir, "etc/plugins/"}.
-
-%% File to store loaded plugin names.
-{plugins_loaded_file, "data/loaded_plugins"}.
-
-%%--------------------------------------------------------------------
-%% Modules
-%%--------------------------------------------------------------------
-
-%% Retainer Module
-{module, retainer, [
-
-    %% disc: disc_copies, ram: ram_copies
-    {storage_type, disc},
-
-    %% Max number of retained messages
-    {max_message_num, 100000},
-
-    %% Max Payload Size of retained message
-    {max_playload_size, 65536},
-
-    %% Expired after seconds, never expired if 0
-    {expired_after, 0}
-
-]}.
-
-%% Client presence management module. Publish presence messages when 
-%% client connected or disconnected.
-{module, presence, [{qos, 0}]}.
-
-%% Subscribe topics automatically when client connected
-{module, subscription, [{"$client/%c", 1}]}.
-
-%% [Rewrite](https://github.com/emqtt/emqttd/wiki/Rewrite)
-%% {module, rewrite, [{config, "etc/modules/rewrite.conf"}]}.
-
-%%-------------------------------------------------------------------
-%% Erlang System Monitor
-%%-------------------------------------------------------------------
-