Del primo so che la posta viene scaricata per essere leggibile anche offline, mentre per IMAP, bisogna essere connessi...
Ma il push????
![Uhm... [uhm]](http://www.megalab.it/forum/images/smilies/Dubbio.gif)
Wikipedia ha scritto:Il termine Push Email (o anche Push To Email) viene generalmente adoperato per indicare la possibilità di un apparecchio come uno smartphone o un palmare di trasferire email in tempo reale.
La possibilità di spedire da, ma soprattutto di ricevere su, terminali mobili (ad es., smartphones e/o palmari) e-mail in tempo reale è data dall’utilizzo di un apposito sistema informatico, grazie al quale le nuove email sono istantaneamente trasferite (da qui il termine push) -non appena arrivate- dall’MDA (Mail Delivery Agent, anche chiamato mail server) al MUA (Mail User Agent, anche chiamato client mail, in sostanza, il terminale mobile).
Wikipedia ha scritto: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 be connected only occasionally and also change network address quite often. For example, a user with a laptop on a WiFi connection may be assigned different addresses from the network DHCP server every once in a while and have no persistent network name, and when new mail arrives to the mail server, it does not know what address the client is currently assigned.
The Internet Message Access Protocol (IMAP) provides support for polling and notifications. When a client receives a notification from a server, the client may choose to fetch the new data from the server. This makes retrieval of new messages more flexible than a purely-push system, because the client can choose whether to download new message data.
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