Details

You can enable this setting to allow users to download the S/MIME control to read and create signed and encrypted messages.

Rationale:

S/MIME uses digital signatures and encryption to protect against several classes of attacks including eavesdropping, impersonation, and tampering.

Solution

To implement the recommended state, execute the following PowerShell cmdlet:

Set-OWAVirtualDirectory -identity ‘owa (Default Web Site)’ -SMimeEnabled $true

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/1512

This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Windows.

References

• 800-53|SC-13

Source

• Tenable.com/audits