This is essentially a mitm attack. I am amazed that a company the size of LinkedIn would think that this is in any way appropriate. These are the tricks of spammers and cyber criminals. This is what LinkedIn has become. Will customers be explicitly told that all of their emails will be going through and stored on LinkedIn servers? I doubt it. I do envision a dialog box along the lines of "Click Here to make your expe…
The "attack" part of "man in the middle attack" refers to the fact that it is done secretly and generally with ill intentions. LinkedIn is not being secretive (and we can speculate about their intentions). If everything that's in the middle of something is a man in the middle attack, then that would include your home router.
I do think LinkedIn has ill intentions. In my opinion, their intentions are to collect, analyze, and ultimately profit from their user's email data. All under the guise of offering some marginal benefit.