How do I ensure that every mail sent by an employee is copied to his or her manager?
Use a combination of domain filters on your Mirapoint or RazorGate appliance that matches the envelope address of the sender. For example:
The rule named "CC Mgr" would match any mail sent from "bob" (with envelope addresses of "firstname.lastname@example.org" or just "email@example.com," etc.). When a message matches it will be automatically redirected to "firstname.lastname@example.org."
A similar filter would need to be written for each employee.
The "Default" rule is needed to ensure that the mail is still relayed normally.
NOTE: After entering the filter rules, finish with an empty rule (".") on a line by itself.