Always use Rich Text formatting in S/MIME messages

By default, Outlook uses the format specified by the user when sending e-mail messages, including when sending S/MIME messages. By enabling this setting, you can change this behavior so that Outlook always uses Rich Text formatting when sending S/MIME messages.

Supported on: At least Windows Vista

Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Microsoft\Office\12.0\Outlook\Security
Value NameForceTNEF
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

outlk12.admx

Administrative Templates (Computers)

Administrative Templates (Users)