My webmail company (finally someone did it) put a bar in my webmail that shows the last time someone logged in and from what IP address. I don't understand why ALL email companies do not do this. Bravo.
Anyway, that's when I found out that someone at this IP address had logged into my email account, and wasn't me:
166.129.232.106
OrgName: Service Provider Corporation
OrgID: SPC-10
Address: 442 Route 202-206 North
Address: # 485
City: Bedminster
StateProv: NJ
PostalCode: 07921-0523
Country: US
NetRange: 166.128.0.0 - 166.255.255.255