Before purchasing a marketing list, you MUST seek written details of how the provider obtained the email addresses and under what terms and conditions. Think carefully about whether you can rely on inferred consent and remember you must still include accurate sender identification information and an unsubscribe facility in your messages.
Lastly before you send to a purchased list have a think about how many people on the list have received emails and how fatigued the list might already be. You could be wasting your time and money and damaging your brand.
Likelihood of a SPAM complaint = HIGH
Likelihood of your email being opened = LOW