Activation · Studio

The spread is what matters on this template: 100 in Superhuman against 73 in Outlook Classic, a 27-point gap across the same file. 6 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 150 warnings behind that score are concentrated there rather than spread evenly.

At 12.8KB compiled it has roughly 89KB 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 verification link and its expiry wording. Activation mail is read in a hurry with the signup form still open in another tab, so the link belongs above the fold and the expiry belongs next to it, not in the footer.

Leave alone. The plain-text fallback of the link. Some clients and most security scanners rewrite or strip the button href, and the visible URL underneath is what saves the activation when they do.

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.