Hi, I'm struggling to get engagement on my growing weekly newsletter (467 subs) that has an educational/tutorial mission. Even with calls to action, I don't get any replies although my opens are good >50%. I have been trying to add links to different things like solutions to practice problems with the goal of get a better signal of whether people are getting anything out of the newsletter. I noticed something curious in my recent newsletter. The same 28 people clicked all of the links. Am I right to assume that there's something going on with their email system to open all links and that their engagement should be discounted? If this is the case then I worry that my engagement is even worse than I had thought :(