error_log /var/log/nginx/error.log info;

events {
worker_connections 1024;
}

stream {
upstream backend {
hash xxx.xxx.xxx.xxx consistent;

server email.domain.tld:448;
}


server {
listen 448;
proxy_connect_timeout 1s;
proxy_timeout 3s;
proxy_pass backend;
}
}

I have difficulties to understand the "main context" idea .... With this exemple, is my "stream" in the right context ?? Seems not.