Plain-text vs HTML email: the placement angle

Plain-text vs HTML email: the placement angle
Framing line: this debate is usually about design, but the resources worth reading make it about the inbox.

🧪 Tests
— Plain-text deliverability experiment — made the cut for the counterintuitive result: stripped-down emails dodge image-heavy spam filters and often hit Primary, not Promotions.
— HTML-to-text ratio study — worth your time because it names the real culprit: it's not HTML itself, it's a single giant image with three words of text.

📥 Swipe
— Hybrid template breakdown — picked it for the practical move: HTML that degrades to clean plain-text, so you keep tracking without the filter penalty.

🚀 Deliverability
— Gmail tab-routing note — earned its spot for explaining why pure plain-text reads as personal to Gmail's classifier.

Rule of thumb: cold outreach plain, branded broadcasts HTML-lite.
Saved you ~2 hours.