@pjz99;
You need to understand that the email may have to travel thru many many different portals before reaching its final destination.  At EACH portal, it leaves it's signature....if it had to pass thru 20 "doors" to get to the recipient......YOUR email addy could have been picked up at EACH of those 20 points....if someone wanted....
If it got recorded at any one of those 20 points by someone that "harvests"....well you'll get all sorts of stuff sent to you.
Sorry, but its just the way email works....

In youth, we learn....with age, we understand.