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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 153 warnings behind that score are concentrated there rather than spread evenly.

At 16.2KB compiled it has roughly 86KB 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 opening line and the single call to action. A welcome is opened once, usually within minutes, and the reader is deciding whether the product is worth a second visit, so name the one thing you want them to do and cut the rest.

Leave alone. The button construction. It is a table cell with padding rather than a styled anchor, which is what keeps the whole shape clickable in Outlook. Swap in a padded <a> and the hit area shrinks to the text itself.

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.