What's the law on email?

My sister has a free email at Yahoo. She thinks someone from Yahoo reads or monitors her email. What's the law? What's the extent?

I know the federal courts have determined that owners may monitor their email systems because they own the computers and software, but I am unsure about Yahoo.

I read their Terms of Service and found the following:
We respond to subpoenas, court orders, or legal process, or to establish or exercise our legal rights or defend against legal claims ;

We believe it is necessary to share information in order to investigate, prevent, or take action regarding illegal activities, suspected fraud, situations involving potential threats to the physical safety of any person, violations of Yahoo's terms of use, or as otherwise required by law.

 

 

 

 

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