What I do with the email is invisible to the sender and it's ok. It's actually the way it should be.

I clearly expressed interest in your newsletter by confirming the double opt-in.

It's also ok if I open your newsletter only once in a while, I may be busy, or I only want to read your content when its title click something in me.

The most successful newsletters respect this and did so for so many years. They never messed up with my subscription. I will never mark them as spam because I trust them. And there is a clear unsubscribe link in every one of them that I can click if I change my mind.

This is nothing new, Permission Marketing from Seth Godin is what, more than 20 years old now?

Instead, automation looks always fun and clever, until your growth-hack goes wrong.