There is none. Anything done on the employer's computer system is the property of the employer.
Americans with Disabilities Act of 1990 [ADA]
it is a protection program for our personal information eg medical records name or address
The Health and Safety at Work Act is UK legislation intended to protect employees in the course of their work.
In Canada we have 'Labor Relations' where you can form a complaint against the company you work for naming the person in that company that is threatening your job by bullying. Often the employee wins...
Always use BCC instead of CC. BCC will not show other people's emails.