To transfer ownership of an email list, the current owner should first ensure that all data is accurate and up-to-date. Next, both parties should agree on the terms of the transfer, including any necessary legal agreements. It is also essential to inform subscribers about the change in ownership, adhering to any regulatory requirements such as those set by the GDPR or CAN-SPAM Act. Finally, the new owner should integrate the list into their email marketing system and start engaging with subscribers under their brand.