Re: Make smtpd/Postscreen compatible with load balancers

[Wietse Venema]

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.

        Wietse