Chatterの[お知らせ]アクションを設定するには、まずユーザに「お知らせメールを送信」権限を付与し、次にChatterグループレイアウトにアクションを追加します。Salesforce ClassicとLightning Experienceで設定箇所が異なるため、それぞれの手順に従って設定を行います。
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