The success of simple layouts can be measured using various metrics such as:
1. Open Rates: Higher open rates indicate that the subject line and preview text are compelling. 2. Click-Through Rates: A high CTR shows that the CTA is effective and the content is engaging. 3. Conversion Rates: Track the number of recipients who complete the desired action, such as making a purchase or signing up for a webinar. 4. User Feedback: Collect feedback from recipients to understand their experience and identify areas for improvement.