It's not necessarily 'spying.' Many large service providers have such as system for logging in as a user to aid in troubleshooting. Yahoo's is known as AMT for

It's not necessarily 'spying.' Many large service providers have such as system for logging in as a user to aid in troubleshooting. Yahoo's is known as AMT for example and lets customer service (or anyone with high enough access clearance) 'be' that user, to see first hand the issues the customer might be dealing with. For everyone who thinks they're an email pro, or never come across problems, there's thousands of users calling any support number they can to try to understand why their junk mail folder won't empty.