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.
Other articles related to "wireless email, email":
... In contrast to traditional email, most of the protocols used in popular current systems are proprietary for example, BlackBerry uses its own private protocols developed by RIM ... to IMAP and SMTP to make them more suited to the demands of mobile email ...