I built a modular magazine email system on a fictional masthead, Vanterre. One master template holds 10 modules, each an mc:repeatable block with an mc:variant name and mc:edit regions, so the Mailchimp editor offers them as a menu. Three emails are built from that library (biweekly issue, launch, waitlist), reusing 6 modules across more than one email. Each email and the master pass 38 checks in total: 600 px maximum width, table layout, no script, form or external stylesheet, alt text and width on every image, live-text headlines, a preheader, dark mode styles, the unsubscribe, address, archive and preferences merge tags, and size under Gmail's clip line (largest 14,567 of 104,448 bytes). 7 color pairs are measured by WCAG ratio, lowest 6.21. The 4 editorial images are illustrated for the system and exported at twice their slot width for high-density screens. The issue cover and the launch cover are also rendered to three social formats from the same tokens.