Email list rental is when you rent an email list from a third-party provider. You can use the list to send marketing emails to a specific audience. The provider owns the list and controls access to it. You can choose a list based on factors like demographics or interests. The provider will send the emails on your behalf or allow you to send them directly. You must ensure that the email list is relevant to your target audience. You should also verify the quality of the list before renting it to ensure your campaign is successful.