Question : redhat linux mail server

Dear Sir/Madam:

I have configured the redhat enterprise linux to work as a mailserver postfix as a MTA , in this i have around 75 real users but i do not want all these users to use this for the mail service instead wanted only 10 users to use this server as a mail server , please help me how to configure this.

Answer : redhat linux mail server

ok check this one :


http://www.postfix.com/RESTRICTION_CLASS_README.html


under this : Restricting what users can send mail to off-site destinations