PING ch-pm.com.cn (58.221.226.166) 56(84) bytes of data.
64 bytes from mail.ch-pm.com.cn (58.221.226.166): icmp_seq=1 ttl=52 time=276 ms
64 bytes from mail.ch-pm.com.cn (58.221.226.166): icmp_seq=2 ttl=52 time=275 ms
64 bytes from mail.ch-pm.com.cn (58.221.226.166): icmp_seq=3 ttl=52 time=276 ms

--- ch-pm.com.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 275.625/276.215/276.866/0.508 ms