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Without the server logs it's hard to be sure. All emails should contain a unique Message-Id header showing which email system or client originated the message. You haven't said whether a corporate email system (such as Exchange) was used or a service not hosted by the company. If it's an internal email system with an IT and HR department, I recommend going to the Human Resources department and filing a formal request for an IT investigation. This should be done as soon as possible.
Bill
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