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I have a Postfix Backend behind HAProxy and check for a response starting with 220 (status code).

backend smtp-backend
        mode tcp
        option tcp-check
        tcp-check expect rstring ^220
        balance roundrobin
        server vtsv-postfix1 172.21.0.137:25 check 
        server vtsv-postfix2 172.21.0.147:25 check

The problem is when i configure the proxy protocol in postfix and use send-proxy for the backend, the health check does not work anymore.

backend smtp-backend
        mode tcp
        option tcp-check
        tcp-check expect rstring ^220
        balance roundrobin
        server vtsv-postfix1 172.21.0.137:25 check send-proxy
        server vtsv-postfix2 172.21.0.147:25 check send-proxy

How can i do a health check to see if postfix is responding with a 220 status code when using the proxy-protocol?

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