@DrChris >I hit send on my phone
Unfortunately it's not yours, the tracking devices owns you instead.

It's all encapsulation.

-Email server
--internet (fibre optic cables with routers bridging them that pretty much send IP packets to the correct destination via BGP arranged routing)
--upstream link (hopefully fibre, but half the time it's throttled 100BASE-TX)
--Wi-Fi AP
---~2.4GHz or ~5GHz radio waves
----802.11{y,n,ac}
-----IP
------TLS
-------TCP
--------STMP
--------Email