diff --git a/include/game/game_handler.hpp b/include/game/game_handler.hpp
index 31a60fb7..0d2883f6 100644
--- a/include/game/game_handler.hpp
+++ b/include/game/game_handler.hpp
@@ -1981,6 +1981,7 @@ public:
     void openMailCompose();
     void closeMailCompose();
     bool hasNewMail() const;
+    void openMailbox(uint64_t guid);
     void closeMailbox();
     void sendMail(const std::string& recipient, const std::string& subject,
                   const std::string& body, uint64_t money, uint64_t cod = 0);
diff --git a/include/game/inventory_handler.hpp b/include/game/inventory_handler.hpp
index d5e0239a..ea64df0d 100644
--- a/include/game/inventory_handler.hpp
+++ b/include/game/inventory_handler.hpp
@@ -149,6 +149,7 @@ public:
     void openMailCompose() { showMailCompose_ = true; clearMailAttachments(); }
     void closeMailCompose() { showMailCompose_ = false; clearMailAttachments(); }
     bool hasNewMail() const { return hasNewMail_; }
+    void openMailbox(uint64_t guid);
     void closeMailbox();
     void sendMail(const std::string& recipient, const std::string& subject,
                   const std::string& body, uint64_t money, uint64_t cod = 0);
diff --git a/src/game/game_handler.cpp b/src/game/game_handler.cpp
index 8e344be7..c1ffd725 100644
--- a/src/game/game_handler.cpp
+++ b/src/game/game_handler.cpp
@@ -5762,8 +5762,7 @@ void GameHandler::performGameObjectInteractionNow(uint64_t guid) {
         // (using lastInteractedGoGuid_ set above). For instant-open chests
         // (no cast), the server sends SMSG_LOOT_RESPONSE directly after USE.
     } else if (isMailbox) {
-        // Server responds with SMSG_SHOW_MAILBOX → InventoryHandler::handleShowMailbox
-        // opens the UI and requests the mail list.
+        openMailbox(guid);
     }
 
     // CMSG_GAMEOBJ_REPORT_USE triggers GO AI scripts (SmartAI, ScriptAI) which
@@ -6532,6 +6531,10 @@ void GameHandler::updateAttachedTransportChildren(float deltaTime) {
 // Mail System
 // ============================================================
 
+void GameHandler::openMailbox(uint64_t guid) {
+    if (inventoryHandler_) inventoryHandler_->openMailbox(guid);
+}
+
 void GameHandler::closeMailbox() {
     if (inventoryHandler_) inventoryHandler_->closeMailbox();
 }
diff --git a/src/game/inventory_handler.cpp b/src/game/inventory_handler.cpp
index 6d90d6d5..4abb9f96 100644
--- a/src/game/inventory_handler.cpp
+++ b/src/game/inventory_handler.cpp
@@ -1536,6 +1536,17 @@ void InventoryHandler::categorizeTrainerSpells() {
 // Mail
 // ============================================================
 
+void InventoryHandler::openMailbox(uint64_t guid) {
+    mailboxGuid_ = guid;
+    mailboxOpen_ = true;
+    hasNewMail_ = false;
+    selectedMailIndex_ = -1;
+    showMailCompose_ = false;
+    clearMailAttachments();
+    if (owner_.addonEventCallback_) owner_.addonEventCallback_("MAIL_SHOW", {});
+    refreshMailList();
+}
+
 void InventoryHandler::closeMailbox() {
     mailboxOpen_ = false;
     mailboxGuid_ = 0;