mail4/5 are monitoring from a nagios install not jodopulse.
I am pinging to mail4/5 just fine here:
Pinging mail5.g********.com [173.0.142.41] with 32 bytes of data:
Reply from 173.0.142.41: bytes=32 time=12ms TTL=59
Reply from 173.0.142.41: bytes=32 time=10ms TTL=59
Reply from 173.0.142.41: bytes=32 time=11ms TTL=59
Reply from 173.0.142.41: bytes=32 time=11ms TTL=59
Ping statistics for 173.0.142.41:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 10ms, Maximum = 12ms, Average = 11ms
C:\Users\Stephen>ping mail4.g********.com
Pinging mail4.g********.com [173.0.137.227] with 32 bytes of data:
Reply from 173.0.137.227: bytes=32 time=12ms TTL=59
Reply from 173.0.137.227: bytes=32 time=13ms TTL=59
Reply from 173.0.137.227: bytes=32 time=11ms TTL=59
Reply from 173.0.137.227: bytes=32 time=11ms TTL=59
Ping statistics for 173.0.137.227:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 11ms, Maximum = 13ms, Average = 11ms