The IP address 217.146.188.108 is a Yahoo routing point, through which the email would have passed to get to aqny number of btinternet accounts. That is not suspicious.
The originating IP address is more significant, but that belongs to
OrgName: ACRONOC INC
OrgID: ACRON-1
Address: 1415 Louisiana St
Address: Suite 12Y Box 8
City: Houston
StateProv: TX
PostalCode: 77002
Country: US
and is also not suspicious.