Wireless Email
Push email is an email system that provides an always-on capability, in which new email is actively transferred (pushed) as it arrives by the mail delivery agent (MDA) (commonly called mail server) to the mail user agent (MUA), also called the email client. Email clients include smartphones and, less strictly, IMAP personal computer mail applications.
Read more about Wireless Email: Comparison With Polling Email, Mobile Users, Simulation Using Traditional Email, Protocols