Encrypting email within domain

[rswift]

I've been asked to secure (encrypt) email within our domain. I've found a few articles on this but the instructions lack direction in some areas. The following link was helpful but not complete.

http://www.msexchange.org/tutorials/Email_Security_with_Exchange_2003.html

Is there a step by step procedure somewhere that could be of assistance?

Thanks in advance

 

[rswift]

Not sure how to do this: "After this procedure you just have to configure this template as a new template of the certificate authority. This can be done using the CA snapin."