The size of your solo ad test campaign will depend on your specific goals, budget, and the level of confidence you want to achieve in the list's performance. When starting to test a new email list, it's often advisable to begin with a relatively small test campaign to assess the list's quality and responsiveness. Here are some considerations to help you determine the size of your initial test campaign before you buy solo ads: Budget: Consider your available budget for testing. Starting with a small campaign allows you to minimize...