# This is required to support the proxy protocol to acquire the correct source ip address from whoever is connecting to this server # It's really important to get this information because otherwise ALL your connections will come from your internal ip address # Guess what you allow to send emails, without question? Thats right! You're $mynetworks. Which means because you cannot get the # correct source ip address, it permits EVERYBODY TO SEND EMAIL THROUGH YOUR SERVER! You basically become an open relay postscreen_upstream_proxy_protocol = haproxy postscreen_upstream_proxy_timeout = 5s