We should have a email spam checker to help our email get into subscribers' email primary inbox successfully, if our email always land on the subscribers email primary inbox, the open rate will increase dramatically. Therefore...more click rate% and more sales. No matter how good the subject line and the copy, if the email falls into promotion inbox, the open rate decrease a lot, and it will be even worst if it falls into the trash inbox. And we can see the difference of landing into the primary inbox and the promotion inbox, and which inbox you want to be? So having a email spam checker to get our email falls into the primary inbox will 100% help us get more email open rate% AND THEN get better marketing & sales result, and make ConvertKit a better app for us to craft email without having all the guess work of is my email going to land on the primary inbox... If you want to see ConvertKit create the email spam checker to help you get more open rate% and get more sales, give a like to