Seperate personal login from business email?

Employee's personal email login "employeeName@yahoo.com" is tied with business email "staff@mydomain.com". She is leaving our company and I need to unlink it, she will continue to use her personal yahoo account and I want to keep her business email account for a while and then in future I... show more Employee's personal email login "employeeName@yahoo.com" is tied with business email "staff@mydomain.com". She is leaving our company and I need to unlink it, she will continue to use her personal yahoo account and I want to keep her business email account for a while and then in future I could delete staff@mydomain.com.
Please advise how I can seperate these relationship between these emails?
3 answers 3