 
The Enrolment Policy for Digi-Mail™ controls the entire certificate issuing process.  Enrolment Policy is set by the Certificate Policy [CP] for the Digi-CA™.  This is a specialist subject and requires experienced knowledge of Certificate Authority [CA] systems and Public Key Infrastructure [PKI].  Keeping this complex topic simple, there are three basic options for Enrolment Policy:

Links:
[1] http://www2.digi-sign.com/digi-mail/distribute/activate