exchange email?

Jon Phillips jon at
Mon Jan 22 09:57:07 CET 2007

On Sun, 2007-01-21 at 11:21 -0500, David Ford wrote:
> The term "Push email" comes from a client signing on to the server and 
> issuing a "look for ..." instruction to the server.  Also known as 
> idling or long-delay poll.
> The logic of it is to have the client only issue new "look for ..." 
> instructions when those instructions change, and until the client 
> disconnects, the server should send "i have new ..." responses whenever 
> it figures out there is new mail.  Following that, the client says 
> "gimme" and all are happy.
> The only problem with this is NAT traversal where a busy firewall ages 
> the oldest idle connections.  To combat this, developers make the client 
> issue "look for ..." rather frequently if such behavior is discovered.  
> Some developers however just play the safe route and always issue the 
> "look for ..." instructions periodically.
> In effect, the logic of this isn't really changed from the original 
> design.  It's just done a bit differently.  Some of it is really just 
> the marketing aspect.  Aunt Millie doesn't grok the protocol.  She just 
> sees the "new feature!" printed boldly on a high priced M$ product box :)
> The only truth in advertising, is that there is rarely truth in advertising.

David, could you help move this discussion to the software page on our
temp wiki:

Others, can you help as well...figuring out software that already exists
will help the project.


> -david
> David Schlesinger wrote:
> >
> > >Microsoft "push email" isn't push at all.  If you read the
> > >specifications, it's just another method of polling a server to
> > >determine if and what segments of new content is ready for transfer.
> >
> > I think this is true for the "Outlook Web Access" interface which, for 
> > instance, Evolution (and Pocket Outlook on Windows Mobile 5!) use. 
> > There's some sort of back-end interface which Outlook 2003 and 
> > Entourage can take advantage of with an Outlook Server; I'm not sure 
> > whether whatever they do there qualifies as "true push email" or not...
> >
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Jon Phillips

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