Send digitally signed messages as clear text if you want to make sure that your digitally signed messages can be opened by all recipients, even if they do not have an S/MIME mail application and can't verify the certificate.

The Signature Details dialog box displays certificate information such as the signer’s name in the Signing as box, and who issued the certificate. Open the file that contains the certificate you want to view.

If you want to insert a digital signature into an email, you need to install a digital ID (certificate), which is verified by a third party. Before you can send and receive messages with encryption or digital signatures, or digital IDs, please follow the instructions to set up encryption in Outlook.

A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.

Send digitally signed messages as clear text if you want to make sure that your digitally signed messages can be opened by all recipients, even if they do not have an S/MIME mail application and can't verify the certificate.

Yes, you can change your signature for each account or have one signature for all of your accounts. To edit your signature: Open Settings. Under Mail, tap Signature. Enter your signature or switch the toggle to enable Per Account Signature, and then enter signatures for each of your accounts.

A digital signature is used to authenticate digital information — such as form templates, e-mail messages, and documents — by using computer cryptography. Digital signatures help to establish the following assurances:

If you're trying to sign in to Office with your Microsoft account, you may get a message asking you for parental permission or to verify your age. For more information about why you're seeing this and how to resolve it, see Parental consent and Microsoft child accounts.

When you need signatures for your documents, there's no need to send multiple drafts or back-and-forth emails to people. Now you can attach documents in e-sign requests and send them directly in Approvals on your desktop or mobile device.

Learn how you can use Outlook for Android or iOS to sign into your Microsoft personal or work/school account.