Limit Users to access mail aliases addressing under same domain

Hi,
I have been working on Postfix for more than 1 year, need Quick Guidance on

How to allow only a group of users to allow access for aliases files in postfix,

as far i have done the usual stuff to include aliases, from /etc/postfix/aliases/executives to include in /etc/aliases.

so as normal all the users under my domain will be able to use aliases addressing,
example (addressing to executives@foo.com, will include all the executives). so this

1, executives@foo.com should be addressed only by a group of users in the same domain and not all ?

for this i have done as added a set of authorised users in /etc/postfix/authorised file and said in main.cf file in smtpd_sender_restrictions to check access from hash:/etc/postfix/authorised.


but unfortuantely not working, please give me a answer for this asap.

Thanks in Advance