A web hosting service that rents out and operates email servers is called as email hosting. In simple terms, if you have a domain name and need an email service on that domain name, you would require to sign up for an email hosting service. Many hosting companies offer free versions of email hosting services and so many businesses take the advantage of the flexibility and power of profession email services. When a separate shared or dedicated mail server manages both incoming and outgoing emails, it is termed as professional email hosting.