C:\>ping pop.mail.yahoo.com.hk
Ping request could not find host pop.mail.yahoo.com.hk. Please check the name an
d try again.

C:\>ping pop.mail.yahoo.com

Pinging pop.vip.sc5.yahoo.com [216.136.173.10] with 32 bytes of data:

Reply from 216.136.173.10: bytes=32 time=418ms TTL=47
Reply from 216.136.173.10: bytes=32 time=393ms TTL=47
Reply from 216.136.173.10: bytes=32 time=379ms TTL=47
Reply from 216.136.173.10: bytes=32 time=362ms TTL=47

Ping statistics for 216.136.173.10:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 362ms, Maximum = 418ms, Average = 388ms

C:\>ping smtp.mail.yahoo.com.hk
Ping request could not find host smtp.mail.yahoo.com.hk. Please check the name a
nd try again.