Hi Everyone,
Welcome to Microsoft Community. First off, we apologize for the delayed response.
I understand that you are receiving someone's email sent to your own account and thinking that someone has the same email address as yours. Let me assist you with this.
As what my colleague mentioned on this thread, all Microsoft accounts are unique and can never
be duplicated. There's a possibility that you are using a recycled account due to inactivity issue. Once the account has been inactive, Microsoft account will be deleted permanently and would be available for registration of new users. That doesn't mean that
someone is also accessing your own account.
Should you have any other concerns, please let us know.
Regards,
Grace