Hi all, I currently have Postfix configured as an internally accessible mail relay. I have an access control list in mynetworks which are the hosts allowed to send mail through this system. This is accomplished by the following entry in main.cf: smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination It works great, but now I want to see if I can modify my configuration to restrict a particular subset of hosts and only allow them to send mail to two specific domains. For example, 192.168.1.100 would only be allowed to relay mail through this system if the destination is example.com or example2.com. Everyone else (specified in mynetworks) is allowed to send mail wherever they want. Is this possible? I read some Postfix documentation but I'm having a hard time piecing it together to accomplish my goal. Any help would be most appreciated. Thanks in advance.