install socat - Multipurpose relay (SOcket CAT) to work as a proxy server for my server centos7

i have a php script installed in my main server and its leaking the server ip while sending Emails like confirmation emails / reset pw emails etc and its leading the attackers to send packets to my server or try any illegal way to damage my server Q : How they my get my server ip ? A : they are getting it when they register in my website and receive the conformation email they can read the message source and they will find out my original ip Example from gmail message source : Received: from [[login to view URL]] (port=39684 helo=[login to view URL]) i'd like to install SoCat to send my requests from a new server [ i have it ready ] both servers running centos 7 the idea is like this A : Main Server with ip [login to view URL] B : Proxy Server [login to view URL] the php script installed in [login to view URL] i want to use the B server to send requests