Whether it’s a new job title (congratulations!) or a phone number change, make sure you keep your email message signature up-to-date. If you're using new Outlook, for more information about email signatures, or if you haven’t created one yet, see Add a signature to messages. Select File > Options > Mail > Signatures. Select the signature you want to edit, and then make your changes in the ...

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 ...

在 Microsoft 365 文件中插入签名行时，作者可以指定有关预期签名者的信息以及签名者的说明。 当将文件的电子副本发送给预期签名人后，此人将看到签名行和要求其签名的通知。

培训：了解如何在 Outlook.com 或Outlook 网页版中创建签名和创建自动答复。

数字签名是电子邮件、宏或电子文档等数字信息上的一种经过加密的电子身份验证戳。 签名用于确认宏或文档来自签名人且未经更改。

培训：观看并了解如何在 Outlook 中创建电子邮件签名。 电子邮件签名可以包括文本、图像、徽标等。

Two-step verification is an optional security feature that, by using two forms of identity—your password, and a contact method (also known as security info)—makes it harder for someone to break into your Microsoft account.

如何将签名添加到Word文档。 还可以使用 Word 中的“签名行”命令插入一行来显示文档的签名位置。

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About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.