Just off the top of my head...
You mentioned the freebsd machine is the gateway. Do you have a firewall on the host blocking connections from the windows machine?
a forgotten detail is that the windows machine sends just fine to the 4.10 gateway for a few minutes, but the time_wait inevitably builds up, so smtp access from windows to either gateway is ok.
Do you have a different kernel configuration between 4.7 and 4.10?
both GENERIC
i.e. do you have something like ipdivert, etc in the kernel on one box and not the other? Can the windows machine ping the ip 192.168.200.59 as its a different class C?
sure, basic connectivity is ok.
Len
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