General
Email Client
Software used to read, send, and manage emails (e.g., Gmail, Outlook, Apple Mail).
Definition
An email client is software or a web application used to access, read, compose, and manage email messages. Email clients can be desktop applications (Outlook, Apple Mail, Thunderbird), mobile apps (Gmail app, iOS Mail), or webmail interfaces (Gmail.com, Outlook.com). Each client may render emails differently, making testing across clients important for marketers.
Examples
Desktop: Microsoft Outlook, Apple Mail, Mozilla ThunderbirdWeb: Gmail, Yahoo Mail, Outlook.comMobile: iOS Mail, Android Gmail