An email hosting service is an internet hosting service that operates email servers.
Email hosting services usually offer premium email at a cost as opposed to advertisement-supported free email or free webmail. Email hosting services thus differ from typical end-user email providers such as webmail sites. They cater mostly to demanding email users and small and medium-sized businesses, while larger enterprises usually run their own email hosting service on their own equipment using software such as Microsoft Exchange or Postfix. Hosting providers can manage a user's own domain name, including any email authentication scheme that the domain owner wishes to enforce in order to convey the meaning that using a specific domain name identifies and qualifies email senders.