In the last episode (Mar 28), Ron said: > Jeffrey Goldberg wrote: > > On Mar 28, 2010, at 1:36 AM, per...@pluto.rain.com wrote: > >> Er, no. POP3 and IMAP are "pull" services, wherein the client polls > >> the server periodically for any newly-arrived messages. > > > > IMAP, but not POP3, can be used to push, but the iPhone mail client > > doesn't support that as far as I know. It does support being pushed to > > over Mobile Me, but not on regular IMAP. > > So how is Mobil Me and Exchange Servers (MS, Zimbra, etc) doing it? > That's what I'd like to replicate on my FreeBsd server. This seems to be > a well guarded secret I'd like to crack. > > On the iPhone, at least, the phone is not polling the servers, some kind > of message (SMS?) is being sent to the phone that makes it put a little > red badge on the corner of the mail app icon telling it how many messages > are waiting. The messages don't seem to be download during the push, it's > just a count (I could be wrong about this).
For ActiveSync at least, the phone has to keep a TCP connection to the server open 24/7, and the server sends a notification when a new mail arrives. MobileMe probably works the same way. The IMAP protocol supports a similar "notify on new mail" option, but for some reason Apple doesn't use it in their client. -- Dan Nelson dnel...@allantgroup.com _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"