What Does Email Client Mean?
Email client is a desktop application that enables configuring one or more email addresses to receive, read, compose and send emails from that email address(s) through the desktop interface. It provides a central interface for receiving, composing and sending emails of configured email address(s).
Techopedia Explains Email Client
Email client primarily is a desktop application that enables users to receive and send emails directly on their desktop. Typically, email client requires an email address to be setup and configured before user can start using email service. These configuration and settings generally include email address, password, POP3/IMAP and SMTP address, port number, email aliases and other related preferences.