Push Mail (or push e-mail) is a technology for mobile email of sending messages to a mobile mail server, typically a smartphone. Unlike traditional email clients which require periodic synchronization (eg, POP3 protocol), push mail as a principle of sends messages directly to mobile.
Push mail is the technology that has contributed to the success of the company Research in Motion (RIM) and its flagship product, the Blackberry.
The new message, prompted by the MDA (Mail Delivery Agent) or mail server is sent to the MUA (Mail User Agent), which is a mobile device, a smartphone like a Blackberry, Android compatible phone or an iPhone.
Unlike conventional mail, push mail is most often based on proprietary protocols. Open standards are beginning to appear, such as Push-IMAP (in) or SyncML (based on XML).