> Non-production release postfix-2.10-20120617-nonprod has support
> for up-stream proxy agents in postscreen(8) and smtpd(8).
>
> To enable, specify one of:
>
> postscreen_upstream_proxy_protocol = haproxy
> smtpd_upstream_proxy_protocol = haproxy
>
> haproxy is not the only proxy agent that works with Postfix. Support
> for nginx with proxied SASL authentication is available in Postfix
> 2.9 smtpd(8). This uses the XCLIENT protocol.
After another week of testing, this is now released as a regular
development release postfix-2.10-20120625.
Wietse
