Policy
Use UserIssuerSerialNumber
Microsoft Office
Policy overview
Key metadata and intent for this policy.
This policy setting determines whether Outlook uses IssuerSerialNumber as the SignerIdentifier, which enables third-party email client software applications to read encrypted Outlook email messages. For more information about Cryptographic Message Syntax, refer to the RFC 5652 specification. If you enable or do not configure this policy setting, Outlook uses the IssuerSerialNumber as the SignerIdentifier. If you disable this policy setting, Outlook uses SubjectKeyIdentifier for the SignerIdentifier, which might prevent third-party email client software applications from reading encrypted Outlook email messages.
Registry values
How enabled and disabled states update the registry.
| Scope | Registry location | Type | Enabled value | Disabled value | Copy |
|---|---|---|---|---|---|
| User | Path software\policies\microsoft\office\16.0\outlook\security Value name useissuerserialnumber | REG_DWORD | HKCU 1 | HKCU 0 |
Policy elements
Inputs and configuration options exposed by this policy.
This policy has no additional user input fields.