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Cc: freebsd-questions@freebsd.org, rg.lists@rzweb.com
Subject: Re: Freebsd, postfix and push email
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Tim Judd <tajudd@gmail.com> wrote:
> On 3/27/10, Ron (Lists) <rg.lists@rzweb.com> wrote:
> > Is there a way to get my freebsd/postfix setup to send push
> > notifications to an iPhone ... I know it can be done with
> > Exchange and ActiveSync, but I don't want to run any kind of
> > exchange server.
>
> Wouldn't push email be a function of your POP3 or IMAP server?
> FreeBSD and Postfix are neither of those.

Er, no.  POP3 and IMAP are "pull" services, wherein the client
polls the server periodically for any newly-arrived messages.
A client-level "push" service would need to operate similarly
to biff(1)/comsat(8).