i'd like to set up an app proxy server at local to resolve contents in mail protocols with SSL/TLS.
using VPN(App Proxy Provider only support HTTP?) to tunnel flows about mail protocols to proxy server seems impracticable
system configuration only supports HTTP and FTP?
is there a way to set a Mail Protocols Proxy at system Level? or is there a way to route all transport layer flows(not only particular Application layer protocol) to proxy server?