Email Client Testing Use Inbox Inspector to make sure your email design looks great in all the major email clients. There are approximately a trillion different clients out there, so we do the work for you by automatically selecting the 10 most‑used clients in your subscriber list.
If you’d prefer to pick which clients will be included in the inspection, you can do that, too. If you want to see more than 10, you can run as many inspections as you’d like. Users with monthly plans get up to 25 free inspections per week.