Summary
The email that earned $120,000 was successful due to indirect selling, plain text format, and an irresistible offer. Instead of directly selling, the email was framed as an order support email, subtly suggesting additional purchases. The plain text format ensured near 100% deliverability and added a personal touch. A compelling 40% off offer was included, which was hard to refuse. The email had a conversion rate of 93% on over 1000 sends.