Email hosting means that a company offers to perform email functions for customers. These functions can be as basic as send and receive and as complicated as database processing and global searching.
By agreeing to provide email hosting, a company must necessarily agree to maintain the security of its clients’ email accounts, as well as the reliability of the servers on which those email accounts are stored. It is common practice for a company that offers email hosting to store its customers’ email archives on its own servers. Because of the always-on nature of email, the company that offers email hosting must also have server power that is always on.