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 ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

What are sensitivity labels? Sensitivity labels are applied either manually or automatically to files to keep them compliant with your organization’s information protection policies. Sensitivity labels indicate the classification of and can apply protection to files. Your organization customizes the label names and descriptions. Contact your organization’s IT department for additional ...

在Outlook 中，可以为电子邮件创建一个或多个个性化签名。 签名可以包括文本、链接、图片和图像 (，例如手写签名或徽标) 。

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Learn how to identify and open encrypted and protected emails no matter what email client you're using.

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Block senders from sending you email in new Outlook for Windows If you're receiving unwanted email, you can block the email addresses and domains you don't want to receive messages from in new Outlook. Add any email address or domain to your blocked senders list to move these messages directly to your Junk Email folder.

Notes: If you're using Microsoft 365, you should stay signed in so that Office stays activated. If you sign out, Office will prompt you to sign back in. To learn more, see What happens when you sign out of Office. Signing out of an Office app does not affect the OneDrive sync app on your computer or mobile. To sign out of OneDrive, read How to remove an account in OneDrive.

Learn how to change Microsoft account email address or phone number using aliases to sign into your Microsoft account.