[Pkg-exim4-users] hosts_proxy support in exim4-daemon-heavy

[Mario Caruso]

Good day,
I'm trying to use the hosts_proxy option on a couple 
of debian jessie 8.7 (amd64) boxes, I've installed the
package from backports , so I have : 

 dpkg -l | fgrep -i exim
ii  exim4-base                        4.88-4~bpo8+1               amd64        support files for all Exim MTA (v4) packages
ii  exim4-config                      4.88-4~bpo8+1               all          configuration for the Exim MTA (v4)
ii  exim4-daemon-heavy        4.88-4~bpo8+1               amd64        Exim MTA (v4) daemon with extended features, including
exiscan-acl

and I made a single exim4.conf file containing all configuration;
everything works until I use the line "hosts_proxy" configuration

hostlist   haproxy_hosts = 10.39.97.251 : 10.39.97.252
#hosts_proxy = haproxy_hosts

if I enable that line I get : main option "hosts_proxy" unknown

I initially thought it was not supported in the package, but 
downloading the sources I found that inside the patches
there are the "proxy-protocol" necessary files, can anyone 
help me in understand if I'm configuring it wrong or if the 
feature is missing in the packages ? 

thank you 

M.
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