I never harassed him about a return receipt. I just get to see when he reads my emails so I know how long it takes him to respond. It's a feature of Superhuman

I never harassed him about a return receipt. I just get to see when he reads my emails so I know how long it takes him to respond. It's a feature of Superhuman. Controversial for sure, but you can even enable them in Gmail. Honestly, a feature built into every Enterprise email software out there. Not uncommon at all.