A well-written email is crucial for maximizing open rates, clicks, and conversions. To achieve a good open rate, one should focus on simple rules such as using personal subject lines, changing the sender to break monotony, and optimizing the timing of sending. However, reader fatigue is a reality, and it's essential to stay relevant by providing value to the reader. Click-through rates can be improved by burying links in a digest style with predictable link locations, making the links obvious, and focusing on customer interests rather than product sales. Ultimately, the key to good email writing lies in understanding the reader's needs and providing value through clear and concise communication.