Mail does not exist in Sw/Sh

It doesn't work either if you try to hack it.

data/items.js

@@ -3569,9 +3569,9 @@ let BattleItems = {
 			if (!this.activeMove) return false;
 			if (this.activeMove.id !== 'knockoff' && this.activeMove.id !== 'thief' && this.activeMove.id !== 'covet') return false;
 		},
-		isUnreleased: true,
 		num: 0,
 		gen: 2,
+		isNonstandard: "Past",
 		desc: "Cannot be given to or taken from a Pokemon, except by Covet/Knock Off/Thief.",
 	},
 	"manectite": {

data/mods/gen7/items.js

@@ -362,6 +362,10 @@ let BattleItems = {
 			}
 		},
 	},
+	mail: {
+		inherit: true,
+		isNonstandard: null,
+	},
 	manectite: {
 		inherit: true,
 		isNonstandard: null,