> What about cases that you get no response? For example I've sent an email or attempted to followup but there's no way for me to get real feedback other than k

> What about cases that you get no response? For example I've sent an email or attempted to followup but there's no way for me to get real feedback other than knowing they clicked on the link or they opened the email because they simply don't reply or answer. That is a very clear response, isn't it? The main thing is: have alternative options.