I spent a week looking at the distribution of scores across 400+ emails in the Kopi public gallery at trykopi.ai/emails, trying to understand what the automated critique was actually penalizing. The gap between 70 and 93 is almost never the copy. It's three things: CTA contrast below the threshold where mobile Gmail renders it as a gray button instead of a colored one, layout hierarchy that frontloads secondary content above the fold, and line-height on body text that renders fine on desktop but collapses to unreadable on a 375px viewport. The problem with every email tool I'd used before is that none of them tell you any of this before you send. You get a blank canvas, a template, and a "preview on mobile" button. The preview shows you what it looks like — it doesn't tell you whether it's broken. Kopi runs every generated email through a scorer that checks 12+ design criteria and returns a 0–100 score with specific callouts: which element failed, why, and what it would take to fix it.…