What is an email client?

An email client, also referred to as a Mail User Agent (MUA), is a computer application that allows you to send and retrieve email. An email client is what you interact with, as opposed to an email server, which transports email. Email clients can be software applications, such as Outlook Express and Lotus notes, or they can be webmail services such as those provided by Yahoo!, Microsoft, and Gmail. 

Email clients are the component within the Simple Mail Transfer Protocol (SMTP) system responsible for creating email messages for transfer to a Mail Transfer Agent (MTA). 


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