Hi Keng,
Symantec Corporation has rebranded the PGP product line to better reflect the Symantec identity. PGP products have been renamed and are now a part of the Symantec Encryption product family.
You can find more information on rebranded names of PGP components in below article.
http://www.symantec.com/docs/TECH197084
Symantec Gateway email solution is designed to encrypt and decrypt email when situated on gateway, SEMS works closely with your exchange or other supported mail server to encrypt and decrypt email traffic. However generating process wise emails on Encryption server is not possible, you might want to use 3rd party utilities/tools (for eg. BLAT) for creating emails automatically via batch script/schedule jobs, these utilities works with exchange mail boxes/pop smtp accounts to send automated emails.
Find below link to documentation of Symantec Encryption management server 3.3.0
http://www.symantec.com/docs/TECH201458