いつでも元のアドレスに戻せますが、新しいアドレスへの変更には厳格なルールがあります。 頻度は「1年に1回」のみ、そして上限は「3回」まで 。どうしても変えたいんだ！ という強い意志で臨むのがよさそうです。

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