Promo · Arcane

The spread is what matters on this template: 100 in Superhuman against 64 in Outlook Classic, a 36-point gap across the same file. 5 of the 21 clients render it without a single flagged property. Outlook Classic is the one to preview against after any edit, because it is where this template has the least margin, and the 199 warnings behind that score are concentrated there rather than spread evenly.

At 19.5KB compiled it has roughly 83KB of headroom before Gmail clips the message at 102KB and hides the rest behind a "View entire message" link. Inlined CSS and base64 images both count toward that, so watch it as you add sections.

Safe to customise. The offer, the deadline and the hero image. Promotional mail lives or dies on whether the offer is legible in the preview pane before any image loads.

Leave alone. The alt text on the hero. Images are blocked by default in Outlook and in a large share of Gmail accounts, so the alt attribute is frequently the entire message, and an unstyled empty alt is a blank rectangle where the offer should be.

Modified it? Check your version against the same 21 clients. The score above is computed from this file, so it moves when the file does.

Scores are computed by the Emailens engine from per-client support data derived from caniemail.com (MIT), analysed against 21 clients and last verified 2026-09-02.