I have a domain name which is company.com and an email address which is email@example.com via POP3 account in my ISP. I want to host mail server locally using same domain which is company.com via exchange. I want to retain the POP3 mail by our ISP at the same time I also want to create another account which is firstname.lastname@example.org in our exchange. Is this possible? Two mail servers using same domain of company.com?