Misc fixes.

Source/Game/Entities/GameObject/GameObject.cs

@@ -1355,6 +1355,9 @@ namespace Game.Entities
             Player playerUser = user.ToPlayer();
             if (playerUser != null)
             {
+                if (!m_goInfo.IsUsableMounted())
+                    playerUser.Dismount();
+
                 playerUser.PlayerTalkClass.ClearMenus();
                 if (GetAI().GossipHello(playerUser))
                     return;

Source/Game/Entities/GameObject/GameObjectData.cs

@@ -256,6 +256,10 @@ namespace Game.Entities
         {
             switch (type)
             {
+                case GameObjectTypes.Mailbox:
+                    return true;
+                case GameObjectTypes.BarberChair:
+                    return false;
                 case GameObjectTypes.QuestGiver:
                     return QuestGiver.allowMounted != 0;
                 case GameObjectTypes.Text: