Date: Sun, 28 Mar 2010 15:38:49 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Ron <rg.lists@rzweb.com> Cc: Tim Judd <tajudd@gmail.com>, perryh@pluto.rain.com, freebsd-questions@freebsd.org, Jeffrey Goldberg <jeffrey@goldmark.org> Subject: Re: Freebsd, postfix and push email Message-ID: <20100328203849.GD4806@dan.emsphone.com> In-Reply-To: <4BAFB9AC.7040406@rzweb.com> References: <4BAED536.2060205@rzweb.com> <ade45ae91003272212j297b1ca2o57fbf682b1832951@mail.gmail.com> <4baef8de.00G1oLWhtZbJ8Rwl%perryh@pluto.rain.com> <E3865D82-E65A-4440-A663-6B3C3C259F6B@goldmark.org> <4BAFB9AC.7040406@rzweb.com>
next in thread | previous in thread | raw e-mail | index | archive | help
In the last episode (Mar 28), Ron said: > Jeffrey Goldberg wrote: > > On Mar 28, 2010, at 1:36 AM, perryh@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 dnelson@allantgroup.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100328203849.GD4806>