Hey, I need to make Postfix(server1) to act as open relay so i can use it as a relay from Qmail(Plesk control Panel-Server2).I just need postfix to handle the requests from Qmail and deliver the messages to the destinations.Qmail will be configured to relay on Postfix server through /var/qmail/control/smtproutes file. PS: Dont worry about the "Open" Relay cause Server1 will use iptables to allow only Plesk's IP for connecting to the Postfix port 25. Thanks