How does Yahoo Push mail work?

When you have the push mail option on, is the iPhone always connecting to the web looking for new mail?.....or does yahoo send it to the phone as soon as you receive it? Just curious as to how push mail will affect my battery life.

MobileDev wrote:
Whenever there's new mail, the server sends a response over the same connection. This is the "push" notification.
I don't think that's quite accurate.
From what I've been able to tell, Yahoo! Push is rather non-standard. Rather than using IMAP IDLE or standard P-IMAP, it uses a proprietary UDP-based form of out-of-band notification. When the phone gets one of these OOB notifications, then it opens a new connection to the IMAP server and checks for mail.
I suspect that many of the reliability problems stem from these OOB notifications not being sent/received correctly (packet loss, perhaps?)

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