Date: Sun, 28 Mar 2010 16:42:01 -0500 From: Jeffrey Goldberg <jeffrey@goldmark.org> To: krad <kraduk@googlemail.com> Cc: Tim Judd <tajudd@gmail.com>, perryh@pluto.rain.com, Dan Nelson <dnelson@allantgroup.com>, Ron <rg.lists@rzweb.com>, freebsd-questions@freebsd.org Subject: Re: Freebsd, postfix and push email Message-ID: <82FC9260-A40A-4507-B43F-FA9F23DF814F@goldmark.org> In-Reply-To: <d36406631003281349j6ac3c591gf664705930b89c87@mail.gmail.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> <20100328203849.GD4806@dan.emsphone.com> <d36406631003281349j6ac3c591gf664705930b89c87@mail.gmail.com>
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On Mar 28, 2010, at 3:49 PM, krad wrote: > On 28 March 2010 21:38, Dan Nelson <dnelson@allantgroup.com> wrote: > In the last episode (Mar 28), Ron said: > > Jeffrey Goldberg wrote: > > > IMAP, but not POP3, can be used to push, but the iPhone mail = client > > > doesn't support that [...] > > So how is Mobil Me and Exchange Servers (MS, Zimbra, etc) doing it? > 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. My understanding is that Apple wants all persistent connections to the = iPhone to go through them, so that there is only one connection. This = is, putatively, for battery life issues. Every pushable client on the = iPhone doesn't maintain its own TCP connection but works through an API = and has to have their service approved by Apple. Apple made an exception for Exchange so that I could sell iPhones to = businesses. For better information than my possibly misremembered speculation, you = would do well to check iPhone developer communities. -j --=20 Jeffrey Goldberg http://www.goldmark.org/jeff/
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