stream {
    log_format basic '$proxy_protocol_addr - [$time_local] '
                     '$protocol $status $bytes_sent $bytes_received '
                     '$session_time';
    upstream imaps {
        server {{ loadbalancer_ip }}:993;
    }
    upstream smtps {
        server {{ loadbalancer_ip }}:465;
    }
    upstream smtptls {
        server {{ loadbalancer_ip }}:587;
    }
    upstream smtp {
        server {{ loadbalancer_ip }}:25;
    }
    upstream managesieve {
        server {{ loadbalancer_ip }}:4190;
    }
    upstream src {
        server {{ loadbalancer_ip }}:2222;
    }

    server {
        set_real_ip_from {{ docker_network }};
        listen     993 proxy_protocol;

        proxy_pass imaps;
        proxy_protocol on;
    }
    server {
        set_real_ip_from {{ docker_network }};
        listen     25 proxy_protocol;

        proxy_pass smtp;
        proxy_protocol on;
    }
    server {
        set_real_ip_from {{ docker_network }};
        listen     587 proxy_protocol;

        proxy_pass smtptls;
        proxy_protocol on;
    }
    server {
        set_real_ip_from {{ docker_network }};
        listen     465 proxy_protocol;

        proxy_pass smtps;
        proxy_protocol on;
    }
    server {
        set_real_ip_from {{ docker_network }};
        listen     4190 proxy_protocol;

        proxy_pass managesieve;
        proxy_protocol on;
    }
    server {
        listen     2222;
        proxy_pass src;
    }
}