CONTENTSWHAT IS PUSH EMAILPROTOCAL USED IN PUSH MAIL TECHNOLOGYSOME POPULAR PUSH MAIL SETUPSDIFFERENT PUSH MAIL PROVIDERS
WHAT IS A PUSH MAIL ?Push email is a method of pushing content (email in this case) over theinternet to your targeted audience.Technically Push Mail can be defined as a e-mail systems that provide an always-on capability, in which new e-mail is actively transferred (pushed) as it arrives bythe mail delivery agent (MDA) (commonly called mail server) to the mail useragent (MUA), also called the e-mail client. E-mail clients include smartphonesand, less strictly, IMAP personal computer mail applications.Push email utilizes a mail delivery system with real-time capability to “push”email through to the client as soon as it arrives, rather than requiring the client topoll and collect or pull mail manually. With a push email smartphone, for example,the client’s mailbox is constantly updated with arriving email without userintervention. Smartphones announce new mail arrival with an alert.
WHAT IS A PUSH MAIL ?Push email can be especially crucial to field reporters, stock marketbusinessmen, military personal and other professionals for whom time isof the essence. A one-minute delay can make all the difference in breaking astory, losing money, or making a crucial sale.
START OF PUSH MAILAlthough push e-mail had existed in wired-based systems for many years,one of the first uses of the system with a portable, "always on" wirelessdevice outside of Asia was the BlackBerry service from Research InMotion. In Japan, "push e-mail" has been standard in cell phones since2000.BlackBerry was the first personal digital assistant (PDA) to offer pushemail and gained near-instant success as a result. Today, many deviceshave incorporated push email, and its popularity continues to grow. Someof the products that have incorporated push email include Chatteremailfor Treo, Nokia Intellisync Wireless Email, Roadsync, and SonyEricsson phones.
PROTOCAL USED IN PUSH MAIL TECHNOLOGYThe different protocols used in Push Mail technology are as follows : RIM’s standards for BlackBerry. Push-IMAP SyncML IETF Lemonade (Its an extension to IMAP and SMTP) Microsoft Exchange 2003 standards.
SOME POPULAR PUSH MAIL SETUPS Microsoft’s Direct Push The IMAP IDLE Push RIM BlackBerry Push
Microsoft’s Direct Push The smartphone sends an HTTP request to the Exchange server, asking to be notified when something changes on the server. This request lasts for the shorter of (a) a timeout period and (b) a change on the server. If there is a change, the Exchange server responds to the smartphone with details of the folders in which the changes have occurred. Upon receiving this response, the smartphone sends a synchronization request in respect of each of the folders notified by the server, and the server delivers the details of the changes – depending on signal strength / connection speed.
Microsoft’s Direct Push If there is no change within the timeout period, the Exchange server sends an empty response to the smartphone. In either case, when the smartphone receives the Exchange response, it reissues the HTTP request – essentially, this is a looping process, and the issue / receive loop is often referred to as the “heartbeat”. Each heartbeat is 309 bytes, and, by default, a heartbeat is issued every 15 minutes.
The IMAP IDLE Push IMAP system works by notifying the smartphone of any changes in the folders on the server when the user is actively monitoring the server. This only works when the mail client on the smartphone is active, and thus notifications stop when a user stops using the mail application or puts the smartphone away. IMAP IDLE issues a “NOOP” (“No Operation”) command to the IMAP server at a regular interval, usually every 15 minutes. By sending this command, the connection is kept active, and thus the user is notified of any changes.
RIM BlackBerry Push To receive data RIM uses a Network Operating Centre (NOC). Here the email is forwarded to your BlackBerry by the RIM-operated NOC only when there is email. Only the first chunk of email is sent. The data is sent via normal UDP packets that are encrypted at the data level. To find out if there is a mail or not the NOC constantly polls the inbox. Once there is a mail the NOC encrypts the data and sends it to the device immediately where ever it is located. In the absence of email, nothing at all happens, and your BlackBerry behaves much like a normal mobile phone.
DIFFERENT PUSH MAIL PROVIDERS Apple iPhone and iPod Touch Google Android Microsoft Windows Mobile and Windows Phone Nokia Symbian Series 60 Nokia Messaging Research In Motion BlackBerry SEVEN Networks Sony Ericsson