Resctrict the no of recepients

How i could restrict the users to send email to the limited number of users and to broadcast email or send to all the users under the one email directory.

Subject: Resctrict the no of recepients

you can either modify your mail template (add your own code) or use a server rule to limit the # of recipients.

Subject: RE: Resctrict the no of recepients

Dear Paul,

Thanks for reply .How i could apply the execption using mail rule ot change of template for the excutive users who will send emails to unlimited users