UNIX for Dummies Questions & Answers

Hi all

We need to block our users sending emails to specific email addresses. At the moment, recipient restrictions is not enabled in our Postfix relay server so all messages submitted from our Exchange server are accepted and relayed.

See entries in our main.cf file:

Code:

 
### Recipient restrictions. 
#smtpd_recipient_restrictions =
#       check_recipient_access hash:/etc/postfix/denied_recipients
#       permit_mynetworks
#       check_recipient_testsend hash:/etc/postfix/testsend
#       reject_unauth_destination
#       reject_unknown_recipient_domain
#       reject_unverified_recipient

Which lines do I need to enable here, in what order, to tell Postfix that if it receives an email, first check if the recipient/s in are not in a blocked list, if not pass on.

Thanks!