Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. 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 ...

See how to view the details for signatures and certificates.

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Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

同样，当你在 Microsoft Outlook 收到包含 数字签名 的消息时，请务必验证签名者是否是你认为此人。 打开数字签名的消息。 查看 “已签名者” 状态行，检查签名邮件的人员的电子邮件地址。

附加到电子邮件的数字签名通过向收件人提供你（而不是冒名顶替者）签名电子邮件内容的保证，从而提供另一层安全性。

电子邮件中的数字签名可帮助收件人验证你是否是可信发件人，是否不是冒名顶替者。 若要使用数字签名，发件人和收件人都必须具有支持相同加密类型的邮件应用程序。

IMAP and POP are two methods to access email. IMAP is the recommended method when you need to check your emails from several different devices, such as a phone, laptop, and tablet. IMAP IMAP allows you to access your email wherever you are, from any device. When you read an email message using IMAP, you aren't actually downloading or storing it on your computer; instead, you're reading it from ...

To learn about digital signatures (also known as digital ID), what they can be used for, and how to them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Signature Line in the Text group. In the Signature Setup dialog ...