Postfix problems

[admins]

Hi all

How could I apply those rules to my postfix on a debian5 in the main.cf:

1: Reject unauthentificated Mail senders (Mail from)
2: Reject senders without reverse dns entries (Mail from)
3: Reject mails wich are not authentificated from customers

Thanks
a lot

admins

[topdog]

smtpd_recipient_restrictions =
        permit_mynetworks
        permit_sasl_authenticated
        reject_unauth_destination
        reject_unknown_recipient_domain
        reject_unknown_sender_domain
        reject_unverified_recipient
        reject_non_fqdn_recipient
        reject_non_fqdn_sender
        reject_invalid_hostname

Look at the postfix docs to see what these options mean