Simpleproxy v2.2b acts as simple tcp proxy that allows you to forward tcp connections from one host to another. It also works though HTTPS and can filter POP3.
You can download it from the following link: https://packetstormsecurity.com/files/download/13344/simpleproxy-2.2b.tar.gz
Source: https://packetstormsecurity.com/files/13344/simpleproxy-2.2b.tar.gz.html