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Nokia Messaging Email is a push email service and client application that supports most of the popular email providers like Windows Live Hotmail, Yahoo! Nokia Messaging servers aggregate messages from up to ten accounts on and pushes them to compliant devices (Nokia S60 and some S40, plus Maemo-based devices like the N900).
For example, a user with a laptop on a Wi-Fi connection may be assigned different addresses from the network DHCP server periodically and have no persistent network name.
When new mail arrives to the mail server, it does not know what address the client is currently assigned.
Outgoing mail is generally pushed from the sender to the final mail delivery agent (and possibly via intermediate mail servers) using Simple Mail Transfer Protocol.
If the receiver uses a polling email delivery protocol, the final step from the last mail delivery agent to the client is done using a poll.
Post Office Protocol (POP3) is an example of a polling email delivery protocol.
At login and later at intervals, the mail user agent (client) polls the mail delivery agent (server) to see if there is new mail, and if so downloads it to a mailbox on the user's computer.
If new mail arrives in the polling interval, it is instantly pulled, using a subscriber's existing wireless phone account.
This allows the device to have a changing IP or to traverse NAT/Proxy.
In Japan, "push email" has been standard in cell phones since 2000.