Measuring trust isn't straightforward, but there are several metrics that can serve as proxies:
1. Open Rates: High open rates indicate that subscribers trust your brand enough to open your emails. 2. Click-Through Rates (CTR): A high CTR suggests that recipients find your content valuable and trustworthy. 3. Unsubscribe Rates: A low unsubscribe rate is a good sign that your subscribers trust and value your emails. 4. Spam Complaints: Few or no spam complaints imply a high level of trust in your email communications.