This. The tech described is pretty neat... Give you my email creds? Hell no. But _I_ could do all that myself. I think that would be one way that linkedin could save this - release an easy to set up open source version, say one click to a heroku instance or something. Then one could add all sorts of smart stuff into their own emails.
Agreed. Imagine if you could have other providers snap into this? It's a shame that they're hacking their way around Apple's walled garden, but a self hosted proxy server is a nifty way to add functionality to email.