Cold emailing purchased lists is a high-risk strategy with multiple downsides. It violates ESP terms of service, potentially leading to account suspension. Domain and IP reputation can be severely damaged, resulting in deliverability issues, including emails landing in spam folders or being blocked entirely. This practice often violates anti-spam laws like GDPR and CAN-SPAM, resulting in legal repercussions. Purchased lists lead to low engagement, high bounce rates, and increased spam complaints. Economically, the cost of building and deploying these campaigns often exceeds the return on investment, making it an inefficient use of resources. Ultimately, cold emailing to purchased lists is considered spam, regardless of technical compliance, and carries significant risks to sender reputation and business credibility.