Interesting - we used to have tracking pixels and now we have upgraded to active code spy pixels?

Tracking pixels go way back, they were used primarily for deliverability and engagement analysis.

The article says that now the sender can see what street you are on. I thought google proxied these so you got a google IP - how do they defeat google's proxy? Also you would think that most email providers would filter out spyware - I have not picked up any of these spy pixels through google so far.