Write a promotional email with one job and one call to action

Write one promotional email for [PRODUCT OR OFFER] going to [LIST DESCRIPTION, E.G. NEWSLETTER SUBSCRIBERS WHO HAVE NOT PURCHASED].

Inputs:
- The offer: [OFFER AND ANY REAL DEADLINE]
- Why this list should care: [THE PROBLEM THIS SOLVES FOR THEM]
- One proof point I can actually support: [PROOF POINT, E.G. GUARANTEE, SPECIFIC FEATURE, RETURN POLICY]

Deliver:
1. Three subject lines, maximum 45 characters each: one curiosity-based, one direct-benefit, one that names the offer plainly.
2. Preview text, maximum 90 characters, adding information the subject line does not repeat.
3. Email body, 120-180 words: open with the reader's situation, not the product; introduce the offer as the resolution; use the proof point once; close with a single call to action. One CTA only — no secondary asks, no P.S. with a different link.
4. Formatting pass: short paragraphs of 1-3 sentences, written to work as plain text with no images, button text of 2-4 words.

Rules: no fake urgency — mention a deadline only if I gave one above. Do not open with "Hope this finds you well" or any variant. Do not invent statistics, customer names, or testimonials. If the inputs are too thin to support a claim, omit the claim rather than padding around it.