diff --git a/Patches/SwapPatch.cs b/Patches/SwapPatch.cs
index d890caf..de28a0a 100644
--- a/Patches/SwapPatch.cs
+++ b/Patches/SwapPatch.cs
@@ -46,6 +46,8 @@ namespace UIFixes
         // The most recent GridItemView that was hovered - needed to forcibly update hover state after swap
         private static GridItemView LastHoveredGridItemView;
 
+        private static EOwnerType[] BannedOwnerTypes = [EOwnerType.Mail, EOwnerType.Trader];
+
         public static void Enable()
         {
             GridItemAddressType = PatchConstants.EftTypes.First(t => typeof(ItemAddress).IsAssignableFrom(t) && t.GetProperty("Grid") != null); // GClass2769
@@ -92,6 +94,11 @@ namespace UIFixes
                 return false;
             }
 
+            if (BannedOwnerTypes.Contains(itemContext.Item.Owner.OwnerType) || BannedOwnerTypes.Contains(targetItemContext.Item.Owner.OwnerType))
+            {
+                return false;
+            }
+
             if (itemContext.Item == targetItemContext.Item || targetItemContext.Item.GetAllParentItems().Contains(itemContext.Item))
             {
                 return false;