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Push email
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<p>Push email is an <a href="/facts/Email/6pD9GLtI">email</a> system that provides an always-on capability, in which when new email arrives at the <a href="/facts/Mail_delivery_agent/Syntl05o">mail delivery agent</a> (MDA) (commonly called mail server), it is immediately, actively transferred (<a href="/facts/Push_technology/KoRjtGET">pushed</a>) by the MDA to the <a href="/facts/Email_client/pQdW9HtC">mail user agent</a> (MUA), also called the email client, so that the end-user can see incoming email immediately. This is in contrast with systems that check for new incoming mail every so often, on a schedule. Email clients include <a href="/facts/Smartphone/cSIrBMWG">smartphones</a> and, less strictly, IMAP personal computer mail applications. </p>