Which of the following is NOT a characteristic of a marketable lead?

A marketable lead is generally defined as a contact who is eligible to receive marketing communications, which includes meeting certain criteria related to their willingness and ability to engage with your marketing efforts.

Having an existing email address is a fundamental characteristic of a marketable lead, as it allows for direct communication. Contacts must also be not blacklisted, meaning they are not on a list that prevents them from receiving emails due to past negative interactions. Similarly, not being hard bounced indicates that the email address is valid and capable of receiving messages, which is crucial for successful outreach.

Being unsubscribed from marketing lists, however, means that the lead has explicitly chosen not to receive marketing communications. As a result, they cannot be considered marketable because they have opted out of the communication channel necessary for marketing campaigns. Therefore, "being unsubscribed from marketing lists" perfectly highlights a characteristic that disqualifies a lead from being marketable, making it the correct answer.