diff --git a/src/main/java/emu/nebula/game/mail/Mailbox.java b/src/main/java/emu/nebula/game/mail/Mailbox.java
index 03527e8..bb9d11d 100644
--- a/src/main/java/emu/nebula/game/mail/Mailbox.java
+++ b/src/main/java/emu/nebula/game/mail/Mailbox.java
@@ -27,6 +27,8 @@ public class Mailbox extends PlayerManager implements GameDatabaseObject, Iterab
     
     private List<GameMail> list;
     
+    private transient boolean newState;
+    
     @Deprecated // Morphia only
     public Mailbox() {
         
@@ -41,6 +43,10 @@ public class Mailbox extends PlayerManager implements GameDatabaseObject, Iterab
         this.save();
     }
     
+    public void clearNewState() {
+        this.newState = false;
+    }
+    
     // TODO optimize to an O(n) algorithm like a map
     public GameMail getMailById(int id) {
         return this.getList().stream()
@@ -56,6 +62,9 @@ public class Mailbox extends PlayerManager implements GameDatabaseObject, Iterab
         // Add to mail list
         this.list.add(mail);
         
+        // Set state
+        this.newState = true;
+        
         // Save to database
         Nebula.getGameDatabase().update(this, getUid(), "lastMailId", this.getLastMailId());
         Nebula.getGameDatabase().addToList(this, getUid(), "list", mail);
diff --git a/src/main/java/emu/nebula/net/NetHandler.java b/src/main/java/emu/nebula/net/NetHandler.java
index fa2bf1d..9eda31a 100644
--- a/src/main/java/emu/nebula/net/NetHandler.java
+++ b/src/main/java/emu/nebula/net/NetHandler.java
@@ -2,7 +2,6 @@ package emu.nebula.net;
 
 import lombok.SneakyThrows;
 import us.hebi.quickbuf.ProtoMessage;
-import us.hebi.quickbuf.ProtoSink;
 
 public abstract class NetHandler {
 
@@ -14,53 +13,22 @@ public abstract class NetHandler {
         return true;
     }
     
+    // Packet encoding helper functions
+    
     public byte[] encodeMsg(int msgId, byte[] packet) {
-        // Create data array
-        byte[] data = new byte[packet.length + 2];
-        
-        // Encode msgId
-        short id = (short) msgId;
-        data[0] = (byte) (id >> 8);
-        data[1] = (byte) id;
-        
-        // Copy packet to data array
-        System.arraycopy(packet, 0, data, 2, packet.length);
-        
-        // Complete
-        return data;
+        return PacketHelper.encodeMsg(msgId, packet);
     }
 
     @SneakyThrows
     public byte[] encodeMsg(int msgId, ProtoMessage<?> proto) {
-        // Create data array
-        byte[] data = new byte[proto.getCachedSize() + 2];
-        
-        // Encode msgId
-        short id = (short) msgId;
-        data[0] = (byte) (id >> 8);
-        data[1] = (byte) id;
-        
-        // Create proto sink
-        var output = ProtoSink.newInstance(data, 2, proto.getCachedSize());
-        
-        // Copy packet to data array
-        proto.writeTo(output);
-        
-        // Complete
-        return data;
+        return PacketHelper.encodeMsg(msgId, proto);
     }
     
     public byte[] encodeMsg(int msgId) {
-        // Create data array
-        byte[] data = new byte[2];
-        
-        // Encode msgId
-        short id = (short) msgId;
-        data[0] = (byte) (id >> 8);
-        data[1] = (byte) id;
-        
-        return data;
+        return PacketHelper.encodeMsg(msgId);
     }
+    
+    // Handler
 
     public abstract byte[] handle(GameSession session, byte[] message) throws Exception;
 
diff --git a/src/main/java/emu/nebula/net/PacketHelper.java b/src/main/java/emu/nebula/net/PacketHelper.java
new file mode 100644
index 0000000..3f81c86
--- /dev/null
+++ b/src/main/java/emu/nebula/net/PacketHelper.java
@@ -0,0 +1,57 @@
+package emu.nebula.net;
+
+import lombok.SneakyThrows;
+import us.hebi.quickbuf.ProtoMessage;
+import us.hebi.quickbuf.ProtoSink;
+
+public class PacketHelper {
+
+    public static byte[] encodeMsg(int msgId, byte[] packet) {
+        // Create data array
+        byte[] data = new byte[packet.length + 2];
+        
+        // Encode msgId
+        short id = (short) msgId;
+        data[0] = (byte) (id >> 8);
+        data[1] = (byte) id;
+        
+        // Copy packet to data array
+        System.arraycopy(packet, 0, data, 2, packet.length);
+        
+        // Complete
+        return data;
+    }
+
+    @SneakyThrows
+    public static byte[] encodeMsg(int msgId, ProtoMessage<?> proto) {
+        // Create data array
+        byte[] data = new byte[proto.getCachedSize() + 2];
+        
+        // Encode msgId
+        short id = (short) msgId;
+        data[0] = (byte) (id >> 8);
+        data[1] = (byte) id;
+        
+        // Create proto sink
+        var output = ProtoSink.newInstance(data, 2, proto.getCachedSize());
+        
+        // Copy packet to data array
+        proto.writeTo(output);
+        
+        // Complete
+        return data;
+    }
+    
+    public static byte[] encodeMsg(int msgId) {
+        // Create data array
+        byte[] data = new byte[2];
+        
+        // Encode msgId
+        short id = (short) msgId;
+        data[0] = (byte) (id >> 8);
+        data[1] = (byte) id;
+        
+        return data;
+    }
+    
+}
diff --git a/src/main/java/emu/nebula/server/handlers/HandlerPlayerPingReq.java b/src/main/java/emu/nebula/server/handlers/HandlerPlayerPingReq.java
index 2e94d1a..5aaa1f7 100644
--- a/src/main/java/emu/nebula/server/handlers/HandlerPlayerPingReq.java
+++ b/src/main/java/emu/nebula/server/handlers/HandlerPlayerPingReq.java
@@ -2,7 +2,9 @@ package emu.nebula.server.handlers;
 
 import emu.nebula.net.NetHandler;
 import emu.nebula.net.NetMsgId;
+import emu.nebula.net.PacketHelper;
 import emu.nebula.proto.PlayerPing.Pong;
+import emu.nebula.proto.Public.MailState;
 import emu.nebula.net.HandlerId;
 import emu.nebula.Nebula;
 import emu.nebula.net.GameSession;
@@ -12,9 +14,24 @@ public class HandlerPlayerPingReq extends NetHandler {
 
     @Override
     public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Create response
         var rsp = Pong.newInstance()
                 .setServerTs(Nebula.getCurrentTime());
         
+        // Update mail state flag
+        if (session.getPlayer().getMailbox().isNewState()) {
+            // Clear
+            session.getPlayer().getMailbox().clearNewState();
+            
+            // Send mail state notify
+            byte[] nextPackage = PacketHelper.encodeMsg(
+                    NetMsgId.mail_state_notify, 
+                    MailState.newInstance().setNew(true)
+            );
+            
+            rsp.setNextPackage(nextPackage);
+        }
+        
         return this.encodeMsg(NetMsgId.player_ping_succeed_ack, rsp);
     }