Purchased lists are ineffective, and that they impact everybody else who uses Mailchimp, too. If you send emails to a list of individuals whose touch info you got, many of the emails will get recognized as spam and you may also get high unsubscribe rates. Some spam filters will flag a email crusade if anyone with a similar IP has sent spam in the past. When you use Mailchimp, your email is introduced via our servers, so if one person sends spam, it may possibly evade other users’ emails from attaining inboxes. But by forbidding Mailchimp users from using bought lists, we increase deliverability for all people.