Using purchased email lists can lead to low open rates and harm your sender reputation. Email providers often flag emails sent to purchased lists as spam. A good open rate for such lists is difficult to define but generally falls below industry averages. Open rates depend on factors like email relevance, audience quality, and list age. You should focus on building a targeted list organically to achieve higher open rates. Engaging content and personalization improve your chances. Purchased lists may seem convenient, but they often cause long-term issues. Prioritizing ethical and permission-based email practices leads to better outcomes.