Only the current version so far — new entries appear as the app ships updates.
CLOMO SecuredMailer is a business app by i Cubed Systems, Inc. with 5,000+ downloads (about 7.6K estimated). +1 installs in the last 7 days. Released Feb 12, 2013. Install growth, rank history, SDKs and ad networks.
From the store listing: “私的なメールアドレスの登録制限、キャッシュ保持制限機能、添付ファイルの不正利用を防ぐファイル連携を禁止等。社外秘のデータを強固に守る安全なメーラーアプリ。”