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?
You’re targeting macOS, right?
If so, I recommend that you use a Network Extension transparent proxy. That allows you to intercept the connections you want and leave the system to deal with the connections you don’t.
is there a way to route all transport layer flows … to proxy server?
Once the transparent claims the flow, it can do whatever it wants with it.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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