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Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public key used to encrypt the message can decipher the message for reading.

Applies To: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016

A digital signature attached to an email message offers another layer of security by providing assurance to the recipient that you—not an imposter—signed the contents of the email message. Your digital signature, which includes your certificate and public key, originates from your digital ID.

Applies To: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013

A digitally encrypted message can only be opened by recipients who have the correct key. A digital signature assures recipients that the message hasn’t been tampered with. Notes: Outlook on the web requires a Windows desktop device to support S/MIME.

Applies To: Outlook.com, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019

You can use S/MIME in Outlook Web App to increase the security of messages. A digitally encrypted message can only be opened by recipients who have the correct key. A digital signature assures recipients that the message hasn’t been tampered with. Note: S/MIME may not be available for your account.

Applies To: Outlook on the web, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019, Outlook Web App

設定畫面為啟用 S/MIME 的位置。. 將 S/MIME 切換為開啟可讓符號、加密及符號 + 加密選項顯示在撰寫視窗中。. 在 Outlook 中，點選左上角的 [ 帳戶 ] 控制項，然後選取左下角附近的 [ 設定 ] 按鈕。. 點選您要開啟 S/MIME 的特定帳戶。. 點選 [安全性]，您應該會找到 ...