The Technical Support engineer at Total Defense (which owns the isheriff.com domain) said that IP address 69.64.127.243 is not theirs and they don't know what it is.
This is the direct response from him:
"Hi Scott ,
This is a little weird ,
a lookup for smtp01-in.isheriff.com should return either 204.232.208.198 or
67.23.41.24 your location and the IP you mentioned is not even our IP . "
So I'm still confused....
Thanks for the quick response.