in reply to
At a guess, it's because you are using UDP for your ping.
If you aim a UDP packet at a 'closed' port, then you get an ICMP 'destination port unreachable' (OTOH).
It means, that it could reach the host, but the port in question wasn't open. Suggest you either try a 'known good' udp port (hard on a mailserver) or use TCP or ICMP instead.
It's not pessimism if there is a worse option, it's not paranoia when they are and it's not cynicism when you're right.