1 · Digest

One column, an intro, three stories with optional images, a sign-off and one button. The weekly letter most companies actually send.

2 · Magazine Pro

Dark masthead, full-width lead story, two stories side by side that stack on phones, an "in brief" list and a promo card.

3 · Announcement Pro

One message: a brand-coloured band with the headline and button, two paragraphs, three facts in a row, closing line.