eBay Email Marketing
Fortunately eBay makes it easy for you to create and run an email marketing campaign and comply with CAN SPAM laws.
They have a built in, automated "opt-in" process when the customer add's your store to their list of favorite sellers that gives them the option to sign up for your newsletter.
Stores Email Marketing makes it easy to send professional-looking emails that tell buyers about your new items, updates, and more!
This is available for free to Store owners. For more information go to:
Link