Use Inbox Inspection to make sure your email design looks great in all the major email clients and mobile apps. There are approximately a trillion different clients out there, so we do the work for you by automatically selecting your readers’ 10 most‑used clients.

Preview your campaigns inside several various email clients. This is a paid feature.

Design aside, Inbox Inspection also helps you stay out of trouble by looking for words and phrases that trigger spam filters, then telling you specifically what’s spammy about your email. Trust us—it’s better to find out ahead of time if your message looks like spam.