There are several ways to collect proprietary data, including:
Subscription Forms: Collect email addresses and basic demographic information through website sign-ups. Surveys and Polls: Gather more detailed information about customer preferences and feedback. Purchase History: Track what products or services customers buy to understand their interests. Website Analytics: Use tools to monitor user behavior on your site, including pages visited, time spent, and interactions. Engagement Metrics: Analyze how recipients interact with your emails (opens, clicks, forwards, etc.).