What do you call email addresses like Hotmail, Gmail or Yahoo! Mail that anyone can register for?
Gmail, Hotmail, Yahoo! Mail and other free email program companies are known as email providers or free email providers, and also as web-based email providers. They offer free email accounts that can be accessed from anywhere in the world using an Internet browser rather than a specific email program on one's computer. They also offer instant messaging, a calendar and other useful communication and organization tools within the free email account. Source: Free Email Providers Guide Web Developer Notes: Web Based Email More Information: Free Email Address Directory