Nicely stated, what I didn't see mentioned was the iframe it introduces into the mail. It can use this iframe to collect all kinds of additional data about you.

Nicely stated, what I didn't see mentioned was the iframe it introduces into the mail. It can use this iframe to collect all kinds of additional data about you. In the first instance I thought this was an app that was running in the background on your phone, I would have called that doing the impossible. This is just a MITM, and not a very good one at that.