SMS Based PUSH Email Server
Comparison with traditional e-mail
Traditional e-mail access over network connections was and still is "pull" based (Post Office Protocol (POP3) is a popular example of a pull based mail delivery protocol.): at login and later in intervals, the Mail User Agent (e-mail reader) polls the Mail Delivery Agent (server) to see if there is new mail, and if so downloads it to a mailbox in the user's home directory. However, mail has always been pushed from the origin to the final Mail Delivery Agent. Extending this push to the last delivery step is what distinguishes push e-mail from traditional e-mail systems.
The reason that pull is the usual method for the last stage of mail delivery is that, while the server Mail Delivery Agent would normally be permanently connected to the network, it does not necessarily know how to locate the client Mail User Agent, which is likely to not only be connected only occasionally, but also to change network address quite often. For example, a user wi....