Since you have noted "since Corporate Compliance said letting someone else (another employee) into your email is not allowed." - I would recommend going one step further for this issue and any further issues that they put all requests in writing to you; and provide a copy for you and your file.

As well as a copy of what ever you do sign returned to you for your own private file - let them know up front you are also keeping a file of all transactions about this activity.... no need to hide the fact you are protecting yourself. You are entitled to copies of anything they expect you to 'comply' with while working .

I am sorry that small employers, with family members working in the offices feel they need to be like this when good employees have health problems.......

Best Wishes ........