Solo ads are email promotions where a marketer pays another list owner to send a message about an offer to their subscribers. These lists are often built around a certain topic like online business or health. An affiliate marketer normally sends traffic from the email to a landing page that collects new email subscribers first. After joining the list, people can receive more helpful emails and then see the affiliate offer later. This method gives more control over communication. Do you think buying email traffic this way is worth testing?