簡単でした。準備はProtonmail無料のアカウントを取得しておいてください。Yahooメールで説明します。 1．Yahoomail>設定>smtp>外部アクセス許可にチェック 2．Protonmail>設定>EasySwitch>Yahoo>IMAP>imap.mail.yahoo.co.jpに変更する>OK 上記1，2さえやれば後は誘導に従うだけ。

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