Open Rates: High open rates indicate that recipients recognize and trust your brand. Click-Through Rates: A high CTR suggests that your content is engaging and relevant. Conversion Rates: This shows how effective your emails are at driving desired actions like purchases or sign-ups. Feedback: Direct feedback through surveys or responses can provide insights into how your audience perceives your brand. Social Media Mentions: Monitor social media for mentions of your brand following email campaigns to gauge public sentiment.