Emmanuel:
>Nginx is mainly a buffering HTTP proxy/reverse proxy and/or a HTTP TLS 
>termination endpoint or raw N to 1 TCP proxy. ...
Nginx can also act very good as a mere TCP proxy with proxy protocol. I am not 
terminating TLS on my VPS except for public websites served directly by the VPS.
>There is a standard for pure raw tcp relaying: SOCKS5. That why I think that 
>IF something should be developed/implemented in postfix for outbound, SOCKS5 
>is one of the best candidate, better than HTTP proxy protocol.
The great and bad thing about standards is that there are often multiple to 
choose from... but fine. Up to the postfix team.
However when I had to solve the same issue with my email test service, proxy 
protocol was a lot easier to integrate than SOCKS5, mostly because all client 
implementations I looked at were either dead or incompatible with other needs. 
That obviously can be different in postfix.

Joachim

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