postfix with both smtpd and smtpd/haproxy

[Roman Naumenko]

Hi,

I'm trying to setup postfix behind haproxy for hailover and 
loadbalancing purpose. It works fine with

smtpd_upstream_proxy_protocol = haproxy

but internal systems like amavis can't deliver mail locally, because :25 
is no longer accepts standard smtp.

Is it possible to configure non-proxy smtpd on port 25 and proxy-smtpd 
on other simultaneously?

Thank you,
--Roman