Software for automatically install SMTP/DKIM/SPF

We need a software (f.ex. perl script) which is able to install DKIM/SPF/SMTP-POSTFIX automatically on different servers but with same OS (Linux / MAc os X 10.6 serveur). The server is clean, so all necessary tools must be included in the automatic install. We will provide the IP, the ReverseDNS for the IP and the user/password which must be used. In the case that you will have to communicate us scripts to run on the terminal, write us an instruction manual for us to complete the installation ourselves by domain name.