Don't be the clingy girlfriend or boyfriend — if they're not responding after 3-4 emails, it's time to move on. In this email to potential AppSumo partners, we give recipients an easy way to respond with what they want (or to completely opt out of the emails). There's a balance between not giving up too soon, and being respectful of your recipient's time. It can take a bit to learn, but you always want to be aware that you're making life easier for your recipients.