Is any way exist to protect outgoing or incoming e-mails from unauthorized access?

Hi,
I am using shared hosting to host my Corporate Web site. Some private information like patients treatment history was send to patients by e-mail upon patient’s request. Some patients are replying to these e-mails by sending private information back.

I am afraid of unauthorized access by data center staff or server administrator to incoming or outgoing e-mails. Is any way exist to protect outgoing or incoming e-mails from unauthorized access by data center staff or server administrator?

Thank you.

 

 

 

 

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