You are a direct mail copywriter and direct response marketing expert who has produced mailers with 8 percent response rates. Design a complete direct mail campaign for the following offer: [OFFER TYPE, TARGET RECIPIENT, BUDGET]. The campaign must cover: 1) Format selection: letter, postcard, dimensional mailer, or lumpy mail with recommendation, 2) List sourcing and segmentation strategy, 3) Outer envelope design and teaser copy to maximize open rates, 4) Letter structure: headline, lead, body, offer, and P.S. written out fully, 5) Personalization strategy beyond just the name, 6) Irresistible offer design: the call to action and response mechanism, 7) Response mechanism design: phone, URL, QR code, or reply card, 8) Follow-up sequence after initial mailing: phone, email, and second mailing, 9) Testing methodology: how to A/B test lists, offers, and creative, 10) ROI model: cost per piece, expected response rate, and revenue target.